Re-enable proto

19 files changed, 4829 insertions, 0 deletions

diff --git a/aero-proto/src/imap/attributes.rs b/aero-proto/src/imap/attributes.rs
new file mode 100644
index 0000000..89446a8
--- /dev/null
+++ b/aero-proto/src/imap/attributes.rs
@@ -0,0 +1,77 @@
+use imap_codec::imap_types::command::FetchModifier;
+use imap_codec::imap_types::fetch::{MacroOrMessageDataItemNames, MessageDataItemName, Section};
+
+/// Internal decisions based on fetched attributes
+/// passed by the client
+
+pub struct AttributesProxy {
+    pub attrs: Vec<MessageDataItemName<'static>>,
+}
+impl AttributesProxy {
+    pub fn new(
+        attrs: &MacroOrMessageDataItemNames<'static>,
+        modifiers: &[FetchModifier],
+        is_uid_fetch: bool,
+    ) -> Self {
+        // Expand macros
+        let mut fetch_attrs = match attrs {
+            MacroOrMessageDataItemNames::Macro(m) => {
+                use imap_codec::imap_types::fetch::Macro;
+                use MessageDataItemName::*;
+                match m {
+                    Macro::All => vec![Flags, InternalDate, Rfc822Size, Envelope],
+                    Macro::Fast => vec![Flags, InternalDate, Rfc822Size],
+                    Macro::Full => vec![Flags, InternalDate, Rfc822Size, Envelope, Body],
+                    _ => {
+                        tracing::error!("unimplemented macro");
+                        vec![]
+                    }
+                }
+            }
+            MacroOrMessageDataItemNames::MessageDataItemNames(a) => a.clone(),
+        };
+
+        // Handle uids
+        if is_uid_fetch && !fetch_attrs.contains(&MessageDataItemName::Uid) {
+            fetch_attrs.push(MessageDataItemName::Uid);
+        }
+
+        // Handle inferred MODSEQ tag
+        let is_changed_since = modifiers
+            .iter()
+            .any(|m| matches!(m, FetchModifier::ChangedSince(..)));
+        if is_changed_since && !fetch_attrs.contains(&MessageDataItemName::ModSeq) {
+            fetch_attrs.push(MessageDataItemName::ModSeq);
+        }
+
+        Self { attrs: fetch_attrs }
+    }
+
+    pub fn is_enabling_condstore(&self) -> bool {
+        self.attrs
+            .iter()
+            .any(|x| matches!(x, MessageDataItemName::ModSeq))
+    }
+
+    pub fn need_body(&self) -> bool {
+        self.attrs.iter().any(|x| match x {
+            MessageDataItemName::Body
+            | MessageDataItemName::Rfc822
+            | MessageDataItemName::Rfc822Text
+            | MessageDataItemName::BodyStructure => true,
+
+            MessageDataItemName::BodyExt {
+                section: Some(section),
+                partial: _,
+                peek: _,
+            } => match section {
+                Section::Header(None)
+                | Section::HeaderFields(None, _)
+                | Section::HeaderFieldsNot(None, _) => false,
+                _ => true,
+            },
+            MessageDataItemName::BodyExt { .. } => true,
+            _ => false,
+        })
+    }
+}
diff --git a/aero-proto/src/imap/capability.rs b/aero-proto/src/imap/capability.rs
new file mode 100644
index 0000000..c76b51c
--- /dev/null
+++ b/aero-proto/src/imap/capability.rs
@@ -0,0 +1,159 @@
+use imap_codec::imap_types::command::{FetchModifier, SelectExamineModifier, StoreModifier};
+use imap_codec::imap_types::core::Vec1;
+use imap_codec::imap_types::extensions::enable::{CapabilityEnable, Utf8Kind};
+use imap_codec::imap_types::response::Capability;
+use std::collections::HashSet;
+
+use crate::imap::attributes::AttributesProxy;
+
+fn capability_unselect() -> Capability<'static> {
+    Capability::try_from("UNSELECT").unwrap()
+}
+
+fn capability_condstore() -> Capability<'static> {
+    Capability::try_from("CONDSTORE").unwrap()
+}
+
+fn capability_uidplus() -> Capability<'static> {
+    Capability::try_from("UIDPLUS").unwrap()
+}
+
+fn capability_liststatus() -> Capability<'static> {
+    Capability::try_from("LIST-STATUS").unwrap()
+}
+
+/*
+fn capability_qresync() -> Capability<'static> {
+    Capability::try_from("QRESYNC").unwrap()
+}
+*/
+
+#[derive(Debug, Clone)]
+pub struct ServerCapability(HashSet<Capability<'static>>);
+
+impl Default for ServerCapability {
+    fn default() -> Self {
+        Self(HashSet::from([
+            Capability::Imap4Rev1,
+            Capability::Enable,
+            Capability::Move,
+            Capability::LiteralPlus,
+            Capability::Idle,
+            capability_unselect(),
+            capability_condstore(),
+            capability_uidplus(),
+            capability_liststatus(),
+            //capability_qresync(),
+        ]))
+    }
+}
+
+impl ServerCapability {
+    pub fn to_vec(&self) -> Vec1<Capability<'static>> {
+        self.0
+            .iter()
+            .map(|v| v.clone())
+            .collect::<Vec<_>>()
+            .try_into()
+            .unwrap()
+    }
+
+    #[allow(dead_code)]
+    pub fn support(&self, cap: &Capability<'static>) -> bool {
+        self.0.contains(cap)
+    }
+}
+
+#[derive(Clone)]
+pub enum ClientStatus {
+    NotSupportedByServer,
+    Disabled,
+    Enabled,
+}
+impl ClientStatus {
+    pub fn is_enabled(&self) -> bool {
+        matches!(self, Self::Enabled)
+    }
+
+    pub fn enable(&self) -> Self {
+        match self {
+            Self::Disabled => Self::Enabled,
+            other => other.clone(),
+        }
+    }
+}
+
+pub struct ClientCapability {
+    pub condstore: ClientStatus,
+    pub utf8kind: Option<Utf8Kind>,
+}
+
+impl ClientCapability {
+    pub fn new(sc: &ServerCapability) -> Self {
+        Self {
+            condstore: match sc.0.contains(&capability_condstore()) {
+                true => ClientStatus::Disabled,
+                _ => ClientStatus::NotSupportedByServer,
+            },
+            utf8kind: None,
+        }
+    }
+
+    pub fn enable_condstore(&mut self) {
+        self.condstore = self.condstore.enable();
+    }
+
+    pub fn attributes_enable(&mut self, ap: &AttributesProxy) {
+        if ap.is_enabling_condstore() {
+            self.enable_condstore()
+        }
+    }
+
+    pub fn fetch_modifiers_enable(&mut self, mods: &[FetchModifier]) {
+        if mods
+            .iter()
+            .any(|x| matches!(x, FetchModifier::ChangedSince(..)))
+        {
+            self.enable_condstore()
+        }
+    }
+
+    pub fn store_modifiers_enable(&mut self, mods: &[StoreModifier]) {
+        if mods
+            .iter()
+            .any(|x| matches!(x, StoreModifier::UnchangedSince(..)))
+        {
+            self.enable_condstore()
+        }
+    }
+
+    pub fn select_enable(&mut self, mods: &[SelectExamineModifier]) {
+        for m in mods.iter() {
+            match m {
+                SelectExamineModifier::Condstore => self.enable_condstore(),
+            }
+        }
+    }
+
+    pub fn try_enable(
+        &mut self,
+        caps: &[CapabilityEnable<'static>],
+    ) -> Vec<CapabilityEnable<'static>> {
+        let mut enabled = vec![];
+        for cap in caps {
+            match cap {
+                CapabilityEnable::CondStore if matches!(self.condstore, ClientStatus::Disabled) => {
+                    self.condstore = ClientStatus::Enabled;
+                    enabled.push(cap.clone());
+                }
+                CapabilityEnable::Utf8(kind) if Some(kind) != self.utf8kind.as_ref() => {
+                    self.utf8kind = Some(kind.clone());
+                    enabled.push(cap.clone());
+                }
+                _ => (),
+            }
+        }
+
+        enabled
+    }
+}
diff --git a/aero-proto/src/imap/command/anonymous.rs b/aero-proto/src/imap/command/anonymous.rs
new file mode 100644
index 0000000..2848c30
--- /dev/null
+++ b/aero-proto/src/imap/command/anonymous.rs
@@ -0,0 +1,84 @@
+use anyhow::Result;
+use imap_codec::imap_types::command::{Command, CommandBody};
+use imap_codec::imap_types::core::AString;
+use imap_codec::imap_types::response::Code;
+use imap_codec::imap_types::secret::Secret;
+
+use aero_user::login::ArcLoginProvider;
+use aero_collections::user::User;
+
+use crate::imap::capability::ServerCapability;
+use crate::imap::command::anystate;
+use crate::imap::flow;
+use crate::imap::response::Response;
+
+//--- dispatching
+
+pub struct AnonymousContext<'a> {
+    pub req: &'a Command<'static>,
+    pub server_capabilities: &'a ServerCapability,
+    pub login_provider: &'a ArcLoginProvider,
+}
+
+pub async fn dispatch(ctx: AnonymousContext<'_>) -> Result<(Response<'static>, flow::Transition)> {
+    match &ctx.req.body {
+        // Any State
+        CommandBody::Noop => anystate::noop_nothing(ctx.req.tag.clone()),
+        CommandBody::Capability => {
+            anystate::capability(ctx.req.tag.clone(), ctx.server_capabilities)
+        }
+        CommandBody::Logout => anystate::logout(),
+
+        // Specific to anonymous context (3 commands)
+        CommandBody::Login { username, password } => ctx.login(username, password).await,
+        CommandBody::Authenticate { .. } => {
+            anystate::not_implemented(ctx.req.tag.clone(), "authenticate")
+        }
+        //StartTLS is not implemented for now, we will probably go full TLS.
+
+        // Collect other commands
+        _ => anystate::wrong_state(ctx.req.tag.clone()),
+    }
+}
+
+//--- Command controllers, private
+
+impl<'a> AnonymousContext<'a> {
+    async fn login(
+        self,
+        username: &AString<'a>,
+        password: &Secret<AString<'a>>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let (u, p) = (
+            std::str::from_utf8(username.as_ref())?,
+            std::str::from_utf8(password.declassify().as_ref())?,
+        );
+        tracing::info!(user = %u, "command.login");
+
+        let creds = match self.login_provider.login(&u, &p).await {
+            Err(e) => {
+                tracing::debug!(error=%e, "authentication failed");
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Authentication failed")
+                        .no()?,
+                    flow::Transition::None,
+                ));
+            }
+            Ok(c) => c,
+        };
+
+        let user = User::new(u.to_string(), creds).await?;
+
+        tracing::info!(username=%u, "connected");
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .code(Code::Capability(self.server_capabilities.to_vec()))
+                .message("Completed")
+                .ok()?,
+            flow::Transition::Authenticate(user),
+        ))
+    }
+}
diff --git a/aero-proto/src/imap/command/anystate.rs b/aero-proto/src/imap/command/anystate.rs
new file mode 100644
index 0000000..718ba3f
--- /dev/null
+++ b/aero-proto/src/imap/command/anystate.rs
@@ -0,0 +1,54 @@
+use anyhow::Result;
+use imap_codec::imap_types::core::Tag;
+use imap_codec::imap_types::response::Data;
+
+use crate::imap::capability::ServerCapability;
+use crate::imap::flow;
+use crate::imap::response::Response;
+
+pub(crate) fn capability(
+    tag: Tag<'static>,
+    cap: &ServerCapability,
+) -> Result<(Response<'static>, flow::Transition)> {
+    let res = Response::build()
+        .tag(tag)
+        .message("Server capabilities")
+        .data(Data::Capability(cap.to_vec()))
+        .ok()?;
+
+    Ok((res, flow::Transition::None))
+}
+
+pub(crate) fn noop_nothing(tag: Tag<'static>) -> Result<(Response<'static>, flow::Transition)> {
+    Ok((
+        Response::build().tag(tag).message("Noop completed.").ok()?,
+        flow::Transition::None,
+    ))
+}
+
+pub(crate) fn logout() -> Result<(Response<'static>, flow::Transition)> {
+    Ok((Response::bye()?, flow::Transition::Logout))
+}
+
+pub(crate) fn not_implemented<'a>(
+    tag: Tag<'a>,
+    what: &str,
+) -> Result<(Response<'a>, flow::Transition)> {
+    Ok((
+        Response::build()
+            .tag(tag)
+            .message(format!("Command not implemented {}", what))
+            .bad()?,
+        flow::Transition::None,
+    ))
+}
+
+pub(crate) fn wrong_state(tag: Tag<'static>) -> Result<(Response<'static>, flow::Transition)> {
+    Ok((
+        Response::build()
+            .tag(tag)
+            .message("Command not authorized in this state")
+            .bad()?,
+        flow::Transition::None,
+    ))
+}
diff --git a/aero-proto/src/imap/command/authenticated.rs b/aero-proto/src/imap/command/authenticated.rs
new file mode 100644
index 0000000..4c8d8c1
--- /dev/null
+++ b/aero-proto/src/imap/command/authenticated.rs
@@ -0,0 +1,682 @@
+use std::collections::BTreeMap;
+use std::sync::Arc;
+use thiserror::Error;
+
+use anyhow::{anyhow, bail, Result};
+use imap_codec::imap_types::command::{
+    Command, CommandBody, ListReturnItem, SelectExamineModifier,
+};
+use imap_codec::imap_types::core::{Atom, Literal, QuotedChar, Vec1};
+use imap_codec::imap_types::datetime::DateTime;
+use imap_codec::imap_types::extensions::enable::CapabilityEnable;
+use imap_codec::imap_types::flag::{Flag, FlagNameAttribute};
+use imap_codec::imap_types::mailbox::{ListMailbox, Mailbox as MailboxCodec};
+use imap_codec::imap_types::response::{Code, CodeOther, Data};
+use imap_codec::imap_types::status::{StatusDataItem, StatusDataItemName};
+
+use aero_collections::mail::uidindex::*;
+use aero_collections::user::User;
+use aero_collections::mail::IMF;
+use aero_collections::mail::namespace::MAILBOX_HIERARCHY_DELIMITER as MBX_HIER_DELIM_RAW;
+
+use crate::imap::capability::{ClientCapability, ServerCapability};
+use crate::imap::command::{anystate, MailboxName};
+use crate::imap::flow;
+use crate::imap::mailbox_view::MailboxView;
+use crate::imap::response::Response;
+
+pub struct AuthenticatedContext<'a> {
+    pub req: &'a Command<'static>,
+    pub server_capabilities: &'a ServerCapability,
+    pub client_capabilities: &'a mut ClientCapability,
+    pub user: &'a Arc<User>,
+}
+
+pub async fn dispatch<'a>(
+    mut ctx: AuthenticatedContext<'a>,
+) -> Result<(Response<'static>, flow::Transition)> {
+    match &ctx.req.body {
+        // Any state
+        CommandBody::Noop => anystate::noop_nothing(ctx.req.tag.clone()),
+        CommandBody::Capability => {
+            anystate::capability(ctx.req.tag.clone(), ctx.server_capabilities)
+        }
+        CommandBody::Logout => anystate::logout(),
+
+        // Specific to this state (11 commands)
+        CommandBody::Create { mailbox } => ctx.create(mailbox).await,
+        CommandBody::Delete { mailbox } => ctx.delete(mailbox).await,
+        CommandBody::Rename { from, to } => ctx.rename(from, to).await,
+        CommandBody::Lsub {
+            reference,
+            mailbox_wildcard,
+        } => ctx.list(reference, mailbox_wildcard, &[], true).await,
+        CommandBody::List {
+            reference,
+            mailbox_wildcard,
+            r#return,
+        } => ctx.list(reference, mailbox_wildcard, r#return, false).await,
+        CommandBody::Status {
+            mailbox,
+            item_names,
+        } => ctx.status(mailbox, item_names).await,
+        CommandBody::Subscribe { mailbox } => ctx.subscribe(mailbox).await,
+        CommandBody::Unsubscribe { mailbox } => ctx.unsubscribe(mailbox).await,
+        CommandBody::Select { mailbox, modifiers } => ctx.select(mailbox, modifiers).await,
+        CommandBody::Examine { mailbox, modifiers } => ctx.examine(mailbox, modifiers).await,
+        CommandBody::Append {
+            mailbox,
+            flags,
+            date,
+            message,
+        } => ctx.append(mailbox, flags, date, message).await,
+
+        // rfc5161 ENABLE
+        CommandBody::Enable { capabilities } => ctx.enable(capabilities),
+
+        // Collect other commands
+        _ => anystate::wrong_state(ctx.req.tag.clone()),
+    }
+}
+
+// --- PRIVATE ---
+impl<'a> AuthenticatedContext<'a> {
+    async fn create(
+        self,
+        mailbox: &MailboxCodec<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name = match mailbox {
+            MailboxCodec::Inbox => {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Cannot create INBOX")
+                        .bad()?,
+                    flow::Transition::None,
+                ));
+            }
+            MailboxCodec::Other(aname) => std::str::from_utf8(aname.as_ref())?,
+        };
+
+        match self.user.create_mailbox(&name).await {
+            Ok(()) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message("CREATE complete")
+                    .ok()?,
+                flow::Transition::None,
+            )),
+            Err(e) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(&e.to_string())
+                    .no()?,
+                flow::Transition::None,
+            )),
+        }
+    }
+
+    async fn delete(
+        self,
+        mailbox: &MailboxCodec<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        match self.user.delete_mailbox(&name).await {
+            Ok(()) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message("DELETE complete")
+                    .ok()?,
+                flow::Transition::None,
+            )),
+            Err(e) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(e.to_string())
+                    .no()?,
+                flow::Transition::None,
+            )),
+        }
+    }
+
+    async fn rename(
+        self,
+        from: &MailboxCodec<'a>,
+        to: &MailboxCodec<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name: &str = MailboxName(from).try_into()?;
+        let new_name: &str = MailboxName(to).try_into()?;
+
+        match self.user.rename_mailbox(&name, &new_name).await {
+            Ok(()) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message("RENAME complete")
+                    .ok()?,
+                flow::Transition::None,
+            )),
+            Err(e) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(e.to_string())
+                    .no()?,
+                flow::Transition::None,
+            )),
+        }
+    }
+
+    async fn list(
+        &mut self,
+        reference: &MailboxCodec<'a>,
+        mailbox_wildcard: &ListMailbox<'a>,
+        must_return: &[ListReturnItem],
+        is_lsub: bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let mbx_hier_delim: QuotedChar = QuotedChar::unvalidated(MBX_HIER_DELIM_RAW);
+
+        let reference: &str = MailboxName(reference).try_into()?;
+        if !reference.is_empty() {
+            return Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message("References not supported")
+                    .bad()?,
+                flow::Transition::None,
+            ));
+        }
+
+        let status_item_names = must_return.iter().find_map(|m| match m {
+            ListReturnItem::Status(v) => Some(v),
+            _ => None,
+        });
+
+        // @FIXME would probably need a rewrite to better use the imap_codec library
+        let wildcard = match mailbox_wildcard {
+            ListMailbox::Token(v) => std::str::from_utf8(v.as_ref())?,
+            ListMailbox::String(v) => std::str::from_utf8(v.as_ref())?,
+        };
+        if wildcard.is_empty() {
+            if is_lsub {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("LSUB complete")
+                        .data(Data::Lsub {
+                            items: vec![],
+                            delimiter: Some(mbx_hier_delim),
+                            mailbox: "".try_into().unwrap(),
+                        })
+                        .ok()?,
+                    flow::Transition::None,
+                ));
+            } else {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("LIST complete")
+                        .data(Data::List {
+                            items: vec![],
+                            delimiter: Some(mbx_hier_delim),
+                            mailbox: "".try_into().unwrap(),
+                        })
+                        .ok()?,
+                    flow::Transition::None,
+                ));
+            }
+        }
+
+        let mailboxes = self.user.list_mailboxes().await?;
+        let mut vmailboxes = BTreeMap::new();
+        for mb in mailboxes.iter() {
+            for (i, _) in mb.match_indices(MBX_HIER_DELIM_RAW) {
+                if i > 0 {
+                    let smb = &mb[..i];
+                    vmailboxes.entry(smb).or_insert(false);
+                }
+            }
+            vmailboxes.insert(mb, true);
+        }
+
+        let mut ret = vec![];
+        for (mb, is_real) in vmailboxes.iter() {
+            if matches_wildcard(&wildcard, mb) {
+                let mailbox: MailboxCodec = mb
+                    .to_string()
+                    .try_into()
+                    .map_err(|_| anyhow!("invalid mailbox name"))?;
+                let mut items = vec![FlagNameAttribute::from(Atom::unvalidated("Subscribed"))];
+
+                // Decoration
+                if !*is_real {
+                    items.push(FlagNameAttribute::Noselect);
+                } else {
+                    match *mb {
+                        "Drafts" => items.push(Atom::unvalidated("Drafts").into()),
+                        "Archive" => items.push(Atom::unvalidated("Archive").into()),
+                        "Sent" => items.push(Atom::unvalidated("Sent").into()),
+                        "Trash" => items.push(Atom::unvalidated("Trash").into()),
+                        _ => (),
+                    };
+                }
+
+                // Result type
+                if is_lsub {
+                    ret.push(Data::Lsub {
+                        items,
+                        delimiter: Some(mbx_hier_delim),
+                        mailbox: mailbox.clone(),
+                    });
+                } else {
+                    ret.push(Data::List {
+                        items,
+                        delimiter: Some(mbx_hier_delim),
+                        mailbox: mailbox.clone(),
+                    });
+                }
+
+                // Also collect status
+                if let Some(sin) = status_item_names {
+                    let ret_attrs = match self.status_items(mb, sin).await {
+                        Ok(a) => a,
+                        Err(e) => {
+                            tracing::error!(err=?e, mailbox=%mb, "Unable to fetch status for mailbox");
+                            continue;
+                        }
+                    };
+
+                    let data = Data::Status {
+                        mailbox,
+                        items: ret_attrs.into(),
+                    };
+
+                    ret.push(data);
+                }
+            }
+        }
+
+        let msg = if is_lsub {
+            "LSUB completed"
+        } else {
+            "LIST completed"
+        };
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message(msg)
+                .many_data(ret)
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    async fn status(
+        &mut self,
+        mailbox: &MailboxCodec<'static>,
+        attributes: &[StatusDataItemName],
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let ret_attrs = match self.status_items(name, attributes).await {
+            Ok(v) => v,
+            Err(e) => match e.downcast_ref::<CommandError>() {
+                Some(CommandError::MailboxNotFound) => {
+                    return Ok((
+                        Response::build()
+                            .to_req(self.req)
+                            .message("Mailbox does not exist")
+                            .no()?,
+                        flow::Transition::None,
+                    ))
+                }
+                _ => return Err(e.into()),
+            },
+        };
+
+        let data = Data::Status {
+            mailbox: mailbox.clone(),
+            items: ret_attrs.into(),
+        };
+
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("STATUS completed")
+                .data(data)
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    async fn status_items(
+        &mut self,
+        name: &str,
+        attributes: &[StatusDataItemName],
+    ) -> Result<Vec<StatusDataItem>> {
+        let mb_opt = self.user.open_mailbox(name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => return Err(CommandError::MailboxNotFound.into()),
+        };
+
+        let view = MailboxView::new(mb, self.client_capabilities.condstore.is_enabled()).await;
+
+        let mut ret_attrs = vec![];
+        for attr in attributes.iter() {
+            ret_attrs.push(match attr {
+                StatusDataItemName::Messages => StatusDataItem::Messages(view.exists()?),
+                StatusDataItemName::Unseen => StatusDataItem::Unseen(view.unseen_count() as u32),
+                StatusDataItemName::Recent => StatusDataItem::Recent(view.recent()?),
+                StatusDataItemName::UidNext => StatusDataItem::UidNext(view.uidnext()),
+                StatusDataItemName::UidValidity => {
+                    StatusDataItem::UidValidity(view.uidvalidity())
+                }
+                StatusDataItemName::Deleted => {
+                    bail!("quota not implemented, can't return deleted elements waiting for EXPUNGE");
+                },
+                StatusDataItemName::DeletedStorage => {
+                    bail!("quota not implemented, can't return freed storage after EXPUNGE will be run");
+                },
+                StatusDataItemName::HighestModSeq => {
+                    self.client_capabilities.enable_condstore();
+                    StatusDataItem::HighestModSeq(view.highestmodseq().get())
+                },
+            });
+        }
+        Ok(ret_attrs)
+    }
+
+    async fn subscribe(
+        self,
+        mailbox: &MailboxCodec<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        if self.user.has_mailbox(&name).await? {
+            Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message("SUBSCRIBE complete")
+                    .ok()?,
+                flow::Transition::None,
+            ))
+        } else {
+            Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(format!("Mailbox {} does not exist", name))
+                    .bad()?,
+                flow::Transition::None,
+            ))
+        }
+    }
+
+    async fn unsubscribe(
+        self,
+        mailbox: &MailboxCodec<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        if self.user.has_mailbox(&name).await? {
+            Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(format!(
+                        "Cannot unsubscribe from mailbox {}: not supported by Aerogramme",
+                        name
+                    ))
+                    .bad()?,
+                flow::Transition::None,
+            ))
+        } else {
+            Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(format!("Mailbox {} does not exist", name))
+                    .no()?,
+                flow::Transition::None,
+            ))
+        }
+    }
+
+    /*
+    * TRACE BEGIN ---
+
+
+    Example:    C: A142 SELECT INBOX
+    S: * 172 EXISTS
+    S: * 1 RECENT
+    S: * OK [UNSEEN 12] Message 12 is first unseen
+    S: * OK [UIDVALIDITY 3857529045] UIDs valid
+    S: * OK [UIDNEXT 4392] Predicted next UID
+    S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
+    S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
+    S: A142 OK [READ-WRITE] SELECT completed
+
+    --- a mailbox with no unseen message -> no unseen entry
+    NOTES:
+      RFC3501 (imap4rev1) says if there is no OK [UNSEEN] response, client must make no assumption,
+                          it is therefore correct to not return it even if there are unseen messages
+      RFC9051 (imap4rev2) says that OK [UNSEEN] responses are deprecated after SELECT and EXAMINE
+      For Aerogramme, we just don't send the OK [UNSEEN], it's correct to do in both specifications.
+
+
+    20 select "INBOX.achats"
+    * FLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded JUNK $label1)
+    * OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded JUNK $label1 \*)] Flags permitted.
+    * 88 EXISTS
+    * 0 RECENT
+    * OK [UIDVALIDITY 1347986788] UIDs valid
+    * OK [UIDNEXT 91] Predicted next UID
+    * OK [HIGHESTMODSEQ 72] Highest
+    20 OK [READ-WRITE] Select completed (0.001 + 0.000 secs).
+
+    * TRACE END ---
+    */
+    async fn select(
+        self,
+        mailbox: &MailboxCodec<'a>,
+        modifiers: &[SelectExamineModifier],
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        self.client_capabilities.select_enable(modifiers);
+
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Mailbox does not exist")
+                        .no()?,
+                    flow::Transition::None,
+                ))
+            }
+        };
+        tracing::info!(username=%self.user.username, mailbox=%name, "mailbox.selected");
+
+        let mb = MailboxView::new(mb, self.client_capabilities.condstore.is_enabled()).await;
+        let data = mb.summary()?;
+
+        Ok((
+            Response::build()
+                .message("Select completed")
+                .to_req(self.req)
+                .code(Code::ReadWrite)
+                .set_body(data)
+                .ok()?,
+            flow::Transition::Select(mb, flow::MailboxPerm::ReadWrite),
+        ))
+    }
+
+    async fn examine(
+        self,
+        mailbox: &MailboxCodec<'a>,
+        modifiers: &[SelectExamineModifier],
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        self.client_capabilities.select_enable(modifiers);
+
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Mailbox does not exist")
+                        .no()?,
+                    flow::Transition::None,
+                ))
+            }
+        };
+        tracing::info!(username=%self.user.username, mailbox=%name, "mailbox.examined");
+
+        let mb = MailboxView::new(mb, self.client_capabilities.condstore.is_enabled()).await;
+        let data = mb.summary()?;
+
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("Examine completed")
+                .code(Code::ReadOnly)
+                .set_body(data)
+                .ok()?,
+            flow::Transition::Select(mb, flow::MailboxPerm::ReadOnly),
+        ))
+    }
+
+    //@FIXME we should write a specific version for the "selected" state
+    //that returns some unsollicited responses
+    async fn append(
+        self,
+        mailbox: &MailboxCodec<'a>,
+        flags: &[Flag<'a>],
+        date: &Option<DateTime>,
+        message: &Literal<'a>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let append_tag = self.req.tag.clone();
+        match self.append_internal(mailbox, flags, date, message).await {
+            Ok((_mb_view, uidvalidity, uid, _modseq)) => Ok((
+                Response::build()
+                    .tag(append_tag)
+                    .message("APPEND completed")
+                    .code(Code::Other(CodeOther::unvalidated(
+                        format!("APPENDUID {} {}", uidvalidity, uid).into_bytes(),
+                    )))
+                    .ok()?,
+                flow::Transition::None,
+            )),
+            Err(e) => Ok((
+                Response::build()
+                    .tag(append_tag)
+                    .message(e.to_string())
+                    .no()?,
+                flow::Transition::None,
+            )),
+        }
+    }
+
+    fn enable(
+        self,
+        cap_enable: &Vec1<CapabilityEnable<'static>>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let mut response_builder = Response::build().to_req(self.req);
+        let capabilities = self.client_capabilities.try_enable(cap_enable.as_ref());
+        if capabilities.len() > 0 {
+            response_builder = response_builder.data(Data::Enabled { capabilities });
+        }
+        Ok((
+            response_builder.message("ENABLE completed").ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    //@FIXME should be refactored and integrated to the mailbox view
+    pub(crate) async fn append_internal(
+        self,
+        mailbox: &MailboxCodec<'a>,
+        flags: &[Flag<'a>],
+        date: &Option<DateTime>,
+        message: &Literal<'a>,
+    ) -> Result<(MailboxView, ImapUidvalidity, ImapUid, ModSeq)> {
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => bail!("Mailbox does not exist"),
+        };
+        let view = MailboxView::new(mb, self.client_capabilities.condstore.is_enabled()).await;
+
+        if date.is_some() {
+            tracing::warn!("Cannot set date when appending message");
+        }
+
+        let msg =
+            IMF::try_from(message.data()).map_err(|_| anyhow!("Could not parse e-mail message"))?;
+        let flags = flags.iter().map(|x| x.to_string()).collect::<Vec<_>>();
+        // TODO: filter allowed flags? ping @Quentin
+
+        let (uidvalidity, uid, modseq) =
+            view.internal.mailbox.append(msg, None, &flags[..]).await?;
+        //let unsollicited = view.update(UpdateParameters::default()).await?;
+
+        Ok((view, uidvalidity, uid, modseq))
+    }
+}
+
+fn matches_wildcard(wildcard: &str, name: &str) -> bool {
+    let wildcard = wildcard.chars().collect::<Vec<char>>();
+    let name = name.chars().collect::<Vec<char>>();
+
+    let mut matches = vec![vec![false; wildcard.len() + 1]; name.len() + 1];
+
+    for i in 0..=name.len() {
+        for j in 0..=wildcard.len() {
+            matches[i][j] = (i == 0 && j == 0)
+                || (j > 0
+                    && matches[i][j - 1]
+                    && (wildcard[j - 1] == '%' || wildcard[j - 1] == '*'))
+                || (i > 0
+                    && j > 0
+                    && matches[i - 1][j - 1]
+                    && wildcard[j - 1] == name[i - 1]
+                    && wildcard[j - 1] != '%'
+                    && wildcard[j - 1] != '*')
+                || (i > 0
+                    && j > 0
+                    && matches[i - 1][j]
+                    && (wildcard[j - 1] == '*'
+                        || (wildcard[j - 1] == '%' && name[i - 1] != MBX_HIER_DELIM_RAW)));
+        }
+    }
+
+    matches[name.len()][wildcard.len()]
+}
+
+#[derive(Error, Debug)]
+pub enum CommandError {
+    #[error("Mailbox not found")]
+    MailboxNotFound,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_wildcard_matches() {
+        assert!(matches_wildcard("INBOX", "INBOX"));
+        assert!(matches_wildcard("*", "INBOX"));
+        assert!(matches_wildcard("%", "INBOX"));
+        assert!(!matches_wildcard("%", "Test.Azerty"));
+        assert!(!matches_wildcard("INBOX.*", "INBOX"));
+        assert!(matches_wildcard("Sent.*", "Sent.A"));
+        assert!(matches_wildcard("Sent.*", "Sent.A.B"));
+        assert!(!matches_wildcard("Sent.%", "Sent.A.B"));
+    }
+}
diff --git a/aero-proto/src/imap/command/mod.rs b/aero-proto/src/imap/command/mod.rs
new file mode 100644
index 0000000..5382d06
--- /dev/null
+++ b/aero-proto/src/imap/command/mod.rs
@@ -0,0 +1,20 @@
+pub mod anonymous;
+pub mod anystate;
+pub mod authenticated;
+pub mod selected;
+
+use aero_collections::mail::namespace::INBOX;
+use imap_codec::imap_types::mailbox::Mailbox as MailboxCodec;
+
+/// Convert an IMAP mailbox name/identifier representation
+/// to an utf-8 string that is used internally in Aerogramme
+struct MailboxName<'a>(&'a MailboxCodec<'a>);
+impl<'a> TryInto<&'a str> for MailboxName<'a> {
+    type Error = std::str::Utf8Error;
+    fn try_into(self) -> Result<&'a str, Self::Error> {
+        match self.0 {
+            MailboxCodec::Inbox => Ok(INBOX),
+            MailboxCodec::Other(aname) => Ok(std::str::from_utf8(aname.as_ref())?),
+        }
+    }
+}
diff --git a/aero-proto/src/imap/command/selected.rs b/aero-proto/src/imap/command/selected.rs
new file mode 100644
index 0000000..190949b
--- /dev/null
+++ b/aero-proto/src/imap/command/selected.rs
@@ -0,0 +1,425 @@
+use std::num::NonZeroU64;
+use std::sync::Arc;
+
+use anyhow::Result;
+use imap_codec::imap_types::command::{Command, CommandBody, FetchModifier, StoreModifier};
+use imap_codec::imap_types::core::Charset;
+use imap_codec::imap_types::fetch::MacroOrMessageDataItemNames;
+use imap_codec::imap_types::flag::{Flag, StoreResponse, StoreType};
+use imap_codec::imap_types::mailbox::Mailbox as MailboxCodec;
+use imap_codec::imap_types::response::{Code, CodeOther};
+use imap_codec::imap_types::search::SearchKey;
+use imap_codec::imap_types::sequence::SequenceSet;
+
+use aero_collections::user::User;
+
+use crate::imap::attributes::AttributesProxy;
+use crate::imap::capability::{ClientCapability, ServerCapability};
+use crate::imap::command::{anystate, authenticated, MailboxName};
+use crate::imap::flow;
+use crate::imap::mailbox_view::{MailboxView, UpdateParameters};
+use crate::imap::response::Response;
+
+pub struct SelectedContext<'a> {
+    pub req: &'a Command<'static>,
+    pub user: &'a Arc<User>,
+    pub mailbox: &'a mut MailboxView,
+    pub server_capabilities: &'a ServerCapability,
+    pub client_capabilities: &'a mut ClientCapability,
+    pub perm: &'a flow::MailboxPerm,
+}
+
+pub async fn dispatch<'a>(
+    ctx: SelectedContext<'a>,
+) -> Result<(Response<'static>, flow::Transition)> {
+    match &ctx.req.body {
+        // Any State
+        // noop is specific to this state
+        CommandBody::Capability => {
+            anystate::capability(ctx.req.tag.clone(), ctx.server_capabilities)
+        }
+        CommandBody::Logout => anystate::logout(),
+
+        // Specific to this state (7 commands + NOOP)
+        CommandBody::Close => match ctx.perm {
+            flow::MailboxPerm::ReadWrite => ctx.close().await,
+            flow::MailboxPerm::ReadOnly => ctx.examine_close().await,
+        },
+        CommandBody::Noop | CommandBody::Check => ctx.noop().await,
+        CommandBody::Fetch {
+            sequence_set,
+            macro_or_item_names,
+            modifiers,
+            uid,
+        } => {
+            ctx.fetch(sequence_set, macro_or_item_names, modifiers, uid)
+                .await
+        }
+        //@FIXME SearchKey::And is a legacy hack, should be refactored
+        CommandBody::Search {
+            charset,
+            criteria,
+            uid,
+        } => {
+            ctx.search(charset, &SearchKey::And(criteria.clone()), uid)
+                .await
+        }
+        CommandBody::Expunge {
+            // UIDPLUS (rfc4315)
+            uid_sequence_set,
+        } => ctx.expunge(uid_sequence_set).await,
+        CommandBody::Store {
+            sequence_set,
+            kind,
+            response,
+            flags,
+            modifiers,
+            uid,
+        } => {
+            ctx.store(sequence_set, kind, response, flags, modifiers, uid)
+                .await
+        }
+        CommandBody::Copy {
+            sequence_set,
+            mailbox,
+            uid,
+        } => ctx.copy(sequence_set, mailbox, uid).await,
+        CommandBody::Move {
+            sequence_set,
+            mailbox,
+            uid,
+        } => ctx.r#move(sequence_set, mailbox, uid).await,
+
+        // UNSELECT extension (rfc3691)
+        CommandBody::Unselect => ctx.unselect().await,
+
+        // In selected mode, we fallback to authenticated when needed
+        _ => {
+            authenticated::dispatch(authenticated::AuthenticatedContext {
+                req: ctx.req,
+                server_capabilities: ctx.server_capabilities,
+                client_capabilities: ctx.client_capabilities,
+                user: ctx.user,
+            })
+            .await
+        }
+    }
+}
+
+// --- PRIVATE ---
+
+impl<'a> SelectedContext<'a> {
+    async fn close(self) -> Result<(Response<'static>, flow::Transition)> {
+        // We expunge messages,
+        // but we don't send the untagged EXPUNGE responses
+        let tag = self.req.tag.clone();
+        self.expunge(&None).await?;
+        Ok((
+            Response::build().tag(tag).message("CLOSE completed").ok()?,
+            flow::Transition::Unselect,
+        ))
+    }
+
+    /// CLOSE in examined state is not the same as in selected state
+    /// (in selected state it also does an EXPUNGE, here it doesn't)
+    async fn examine_close(self) -> Result<(Response<'static>, flow::Transition)> {
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("CLOSE completed")
+                .ok()?,
+            flow::Transition::Unselect,
+        ))
+    }
+
+    async fn unselect(self) -> Result<(Response<'static>, flow::Transition)> {
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("UNSELECT completed")
+                .ok()?,
+            flow::Transition::Unselect,
+        ))
+    }
+
+    pub async fn fetch(
+        self,
+        sequence_set: &SequenceSet,
+        attributes: &'a MacroOrMessageDataItemNames<'static>,
+        modifiers: &[FetchModifier],
+        uid: &bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let ap = AttributesProxy::new(attributes, modifiers, *uid);
+        let mut changed_since: Option<NonZeroU64> = None;
+        modifiers.iter().for_each(|m| match m {
+            FetchModifier::ChangedSince(val) => {
+                changed_since = Some(*val);
+            }
+        });
+
+        match self
+            .mailbox
+            .fetch(sequence_set, &ap, changed_since, uid)
+            .await
+        {
+            Ok(resp) => {
+                // Capabilities enabling logic only on successful command
+                // (according to my understanding of the spec)
+                self.client_capabilities.attributes_enable(&ap);
+                self.client_capabilities.fetch_modifiers_enable(modifiers);
+
+                // Response to the client
+                Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("FETCH completed")
+                        .set_body(resp)
+                        .ok()?,
+                    flow::Transition::None,
+                ))
+            }
+            Err(e) => Ok((
+                Response::build()
+                    .to_req(self.req)
+                    .message(e.to_string())
+                    .no()?,
+                flow::Transition::None,
+            )),
+        }
+    }
+
+    pub async fn search(
+        self,
+        charset: &Option<Charset<'a>>,
+        criteria: &SearchKey<'a>,
+        uid: &bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        let (found, enable_condstore) = self.mailbox.search(charset, criteria, *uid).await?;
+        if enable_condstore {
+            self.client_capabilities.enable_condstore();
+        }
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .set_body(found)
+                .message("SEARCH completed")
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    pub async fn noop(self) -> Result<(Response<'static>, flow::Transition)> {
+        self.mailbox.internal.mailbox.force_sync().await?;
+
+        let updates = self.mailbox.update(UpdateParameters::default()).await?;
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("NOOP completed.")
+                .set_body(updates)
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    async fn expunge(
+        self,
+        uid_sequence_set: &Option<SequenceSet>,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        if let Some(failed) = self.fail_read_only() {
+            return Ok((failed, flow::Transition::None));
+        }
+
+        let tag = self.req.tag.clone();
+        let data = self.mailbox.expunge(uid_sequence_set).await?;
+
+        Ok((
+            Response::build()
+                .tag(tag)
+                .message("EXPUNGE completed")
+                .set_body(data)
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    async fn store(
+        self,
+        sequence_set: &SequenceSet,
+        kind: &StoreType,
+        response: &StoreResponse,
+        flags: &[Flag<'a>],
+        modifiers: &[StoreModifier],
+        uid: &bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        if let Some(failed) = self.fail_read_only() {
+            return Ok((failed, flow::Transition::None));
+        }
+
+        let mut unchanged_since: Option<NonZeroU64> = None;
+        modifiers.iter().for_each(|m| match m {
+            StoreModifier::UnchangedSince(val) => {
+                unchanged_since = Some(*val);
+            }
+        });
+
+        let (data, modified) = self
+            .mailbox
+            .store(sequence_set, kind, response, flags, unchanged_since, uid)
+            .await?;
+
+        let mut ok_resp = Response::build()
+            .to_req(self.req)
+            .message("STORE completed")
+            .set_body(data);
+
+        match modified[..] {
+            [] => (),
+            [_head, ..] => {
+                let modified_str = format!(
+                    "MODIFIED {}",
+                    modified
+                        .into_iter()
+                        .map(|x| x.to_string())
+                        .collect::<Vec<_>>()
+                        .join(",")
+                );
+                ok_resp = ok_resp.code(Code::Other(CodeOther::unvalidated(
+                    modified_str.into_bytes(),
+                )));
+            }
+        };
+
+        self.client_capabilities.store_modifiers_enable(modifiers);
+
+        Ok((ok_resp.ok()?, flow::Transition::None))
+    }
+
+    async fn copy(
+        self,
+        sequence_set: &SequenceSet,
+        mailbox: &MailboxCodec<'a>,
+        uid: &bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        //@FIXME Could copy be valid in EXAMINE mode?
+        if let Some(failed) = self.fail_read_only() {
+            return Ok((failed, flow::Transition::None));
+        }
+
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Destination mailbox does not exist")
+                        .code(Code::TryCreate)
+                        .no()?,
+                    flow::Transition::None,
+                ))
+            }
+        };
+
+        let (uidval, uid_map) = self.mailbox.copy(sequence_set, mb, uid).await?;
+
+        let copyuid_str = format!(
+            "{} {} {}",
+            uidval,
+            uid_map
+                .iter()
+                .map(|(sid, _)| format!("{}", sid))
+                .collect::<Vec<_>>()
+                .join(","),
+            uid_map
+                .iter()
+                .map(|(_, tuid)| format!("{}", tuid))
+                .collect::<Vec<_>>()
+                .join(",")
+        );
+
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("COPY completed")
+                .code(Code::Other(CodeOther::unvalidated(
+                    format!("COPYUID {}", copyuid_str).into_bytes(),
+                )))
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    async fn r#move(
+        self,
+        sequence_set: &SequenceSet,
+        mailbox: &MailboxCodec<'a>,
+        uid: &bool,
+    ) -> Result<(Response<'static>, flow::Transition)> {
+        if let Some(failed) = self.fail_read_only() {
+            return Ok((failed, flow::Transition::None));
+        }
+
+        let name: &str = MailboxName(mailbox).try_into()?;
+
+        let mb_opt = self.user.open_mailbox(&name).await?;
+        let mb = match mb_opt {
+            Some(mb) => mb,
+            None => {
+                return Ok((
+                    Response::build()
+                        .to_req(self.req)
+                        .message("Destination mailbox does not exist")
+                        .code(Code::TryCreate)
+                        .no()?,
+                    flow::Transition::None,
+                ))
+            }
+        };
+
+        let (uidval, uid_map, data) = self.mailbox.r#move(sequence_set, mb, uid).await?;
+
+        // compute code
+        let copyuid_str = format!(
+            "{} {} {}",
+            uidval,
+            uid_map
+                .iter()
+                .map(|(sid, _)| format!("{}", sid))
+                .collect::<Vec<_>>()
+                .join(","),
+            uid_map
+                .iter()
+                .map(|(_, tuid)| format!("{}", tuid))
+                .collect::<Vec<_>>()
+                .join(",")
+        );
+
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("COPY completed")
+                .code(Code::Other(CodeOther::unvalidated(
+                    format!("COPYUID {}", copyuid_str).into_bytes(),
+                )))
+                .set_body(data)
+                .ok()?,
+            flow::Transition::None,
+        ))
+    }
+
+    fn fail_read_only(&self) -> Option<Response<'static>> {
+        match self.perm {
+            flow::MailboxPerm::ReadWrite => None,
+            flow::MailboxPerm::ReadOnly => Some(
+                Response::build()
+                    .to_req(self.req)
+                    .message("Write command are forbidden while exmining mailbox")
+                    .no()
+                    .unwrap(),
+            ),
+        }
+    }
+}
diff --git a/aero-proto/src/imap/flags.rs b/aero-proto/src/imap/flags.rs
new file mode 100644
index 0000000..0f6ec64
--- /dev/null
+++ b/aero-proto/src/imap/flags.rs
@@ -0,0 +1,30 @@
+use imap_codec::imap_types::core::Atom;
+use imap_codec::imap_types::flag::{Flag, FlagFetch};
+
+pub fn from_str(f: &str) -> Option<FlagFetch<'static>> {
+    match f.chars().next() {
+        Some('\\') => match f {
+            "\\Seen" => Some(FlagFetch::Flag(Flag::Seen)),
+            "\\Answered" => Some(FlagFetch::Flag(Flag::Answered)),
+            "\\Flagged" => Some(FlagFetch::Flag(Flag::Flagged)),
+            "\\Deleted" => Some(FlagFetch::Flag(Flag::Deleted)),
+            "\\Draft" => Some(FlagFetch::Flag(Flag::Draft)),
+            "\\Recent" => Some(FlagFetch::Recent),
+            _ => match Atom::try_from(f.strip_prefix('\\').unwrap().to_string()) {
+                Err(_) => {
+                    tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
+                    None
+                }
+                Ok(a) => Some(FlagFetch::Flag(Flag::system(a))),
+            },
+        },
+        Some(_) => match Atom::try_from(f.to_string()) {
+            Err(_) => {
+                tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
+                None
+            }
+            Ok(a) => Some(FlagFetch::Flag(Flag::keyword(a))),
+        },
+        None => None,
+    }
+}
diff --git a/aero-proto/src/imap/flow.rs b/aero-proto/src/imap/flow.rs
new file mode 100644
index 0000000..1986447
--- /dev/null
+++ b/aero-proto/src/imap/flow.rs
@@ -0,0 +1,115 @@
+use std::error::Error as StdError;
+use std::fmt;
+use std::sync::Arc;
+
+use imap_codec::imap_types::core::Tag;
+use tokio::sync::Notify;
+
+use aero_collections::user::User;
+
+use crate::imap::mailbox_view::MailboxView;
+
+#[derive(Debug)]
+pub enum Error {
+    ForbiddenTransition,
+}
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Forbidden Transition")
+    }
+}
+impl StdError for Error {}
+
+pub enum State {
+    NotAuthenticated,
+    Authenticated(Arc<User>),
+    Selected(Arc<User>, MailboxView, MailboxPerm),
+    Idle(
+        Arc<User>,
+        MailboxView,
+        MailboxPerm,
+        Tag<'static>,
+        Arc<Notify>,
+    ),
+    Logout,
+}
+impl State {
+    pub fn notify(&self) -> Option<Arc<Notify>> {
+        match self {
+            Self::Idle(_, _, _, _, anotif) => Some(anotif.clone()),
+            _ => None,
+        }
+    }
+}
+impl fmt::Display for State {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use State::*;
+        match self {
+            NotAuthenticated => write!(f, "NotAuthenticated"),
+            Authenticated(..) => write!(f, "Authenticated"),
+            Selected(..) => write!(f, "Selected"),
+            Idle(..) => write!(f, "Idle"),
+            Logout => write!(f, "Logout"),
+        }
+    }
+}
+
+#[derive(Clone)]
+pub enum MailboxPerm {
+    ReadOnly,
+    ReadWrite,
+}
+
+pub enum Transition {
+    None,
+    Authenticate(Arc<User>),
+    Select(MailboxView, MailboxPerm),
+    Idle(Tag<'static>, Notify),
+    UnIdle,
+    Unselect,
+    Logout,
+}
+impl fmt::Display for Transition {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use Transition::*;
+        match self {
+            None => write!(f, "None"),
+            Authenticate(..) => write!(f, "Authenticated"),
+            Select(..) => write!(f, "Selected"),
+            Idle(..) => write!(f, "Idle"),
+            UnIdle => write!(f, "UnIdle"),
+            Unselect => write!(f, "Unselect"),
+            Logout => write!(f, "Logout"),
+        }
+    }
+}
+
+// See RFC3501 section 3.
+// https://datatracker.ietf.org/doc/html/rfc3501#page-13
+impl State {
+    pub fn apply(&mut self, tr: Transition) -> Result<(), Error> {
+        tracing::debug!(state=%self, transition=%tr, "try change state");
+
+        let new_state = match (std::mem::replace(self, State::Logout), tr) {
+            (s, Transition::None) => s,
+            (State::NotAuthenticated, Transition::Authenticate(u)) => State::Authenticated(u),
+            (State::Authenticated(u) | State::Selected(u, _, _), Transition::Select(m, p)) => {
+                State::Selected(u, m, p)
+            }
+            (State::Selected(u, _, _), Transition::Unselect) => State::Authenticated(u.clone()),
+            (State::Selected(u, m, p), Transition::Idle(t, s)) => {
+                State::Idle(u, m, p, t, Arc::new(s))
+            }
+            (State::Idle(u, m, p, _, _), Transition::UnIdle) => State::Selected(u, m, p),
+            (_, Transition::Logout) => State::Logout,
+            (s, t) => {
+                tracing::error!(state=%s, transition=%t, "forbidden transition");
+                return Err(Error::ForbiddenTransition);
+            }
+        };
+        *self = new_state;
+        tracing::debug!(state=%self, "transition succeeded");
+
+        Ok(())
+    }
+}
diff --git a/aero-proto/src/imap/imf_view.rs b/aero-proto/src/imap/imf_view.rs
new file mode 100644
index 0000000..a4ca2e8
--- /dev/null
+++ b/aero-proto/src/imap/imf_view.rs
@@ -0,0 +1,109 @@
+use anyhow::{anyhow, Result};
+use chrono::naive::NaiveDate;
+
+use imap_codec::imap_types::core::{IString, NString};
+use imap_codec::imap_types::envelope::{Address, Envelope};
+
+use eml_codec::imf;
+
+pub struct ImfView<'a>(pub &'a imf::Imf<'a>);
+
+impl<'a> ImfView<'a> {
+    pub fn naive_date(&self) -> Result<NaiveDate> {
+        Ok(self.0.date.ok_or(anyhow!("date is not set"))?.date_naive())
+    }
+
+    /// Envelope rules are defined in RFC 3501, section 7.4.2
+    /// https://datatracker.ietf.org/doc/html/rfc3501#section-7.4.2
+    ///
+    /// Some important notes:
+    ///
+    /// If the Sender or Reply-To lines are absent in the [RFC-2822]
+    /// header, or are present but empty, the server sets the
+    /// corresponding member of the envelope to be the same value as
+    /// the from member (the client is not expected to know to do
+    /// this). Note: [RFC-2822] requires that all messages have a valid
+    /// From header.  Therefore, the from, sender, and reply-to
+    /// members in the envelope can not be NIL.
+    ///
+    /// If the Date, Subject, In-Reply-To, and Message-ID header lines
+    /// are absent in the [RFC-2822] header, the corresponding member
+    /// of the envelope is NIL; if these header lines are present but
+    /// empty the corresponding member of the envelope is the empty
+    /// string.
+
+    //@FIXME return an error if the envelope is invalid instead of panicking
+    //@FIXME some fields must be defaulted if there are not set.
+    pub fn message_envelope(&self) -> Envelope<'static> {
+        let msg = self.0;
+        let from = msg.from.iter().map(convert_mbx).collect::<Vec<_>>();
+
+        Envelope {
+            date: NString(
+                msg.date
+                    .as_ref()
+                    .map(|d| IString::try_from(d.to_rfc3339()).unwrap()),
+            ),
+            subject: NString(
+                msg.subject
+                    .as_ref()
+                    .map(|d| IString::try_from(d.to_string()).unwrap()),
+            ),
+            sender: msg
+                .sender
+                .as_ref()
+                .map(|v| vec![convert_mbx(v)])
+                .unwrap_or(from.clone()),
+            reply_to: if msg.reply_to.is_empty() {
+                from.clone()
+            } else {
+                convert_addresses(&msg.reply_to)
+            },
+            from,
+            to: convert_addresses(&msg.to),
+            cc: convert_addresses(&msg.cc),
+            bcc: convert_addresses(&msg.bcc),
+            in_reply_to: NString(
+                msg.in_reply_to
+                    .iter()
+                    .next()
+                    .map(|d| IString::try_from(d.to_string()).unwrap()),
+            ),
+            message_id: NString(
+                msg.msg_id
+                    .as_ref()
+                    .map(|d| IString::try_from(d.to_string()).unwrap()),
+            ),
+        }
+    }
+}
+
+pub fn convert_addresses(addrlist: &Vec<imf::address::AddressRef>) -> Vec<Address<'static>> {
+    let mut acc = vec![];
+    for item in addrlist {
+        match item {
+            imf::address::AddressRef::Single(a) => acc.push(convert_mbx(a)),
+            imf::address::AddressRef::Many(l) => acc.extend(l.participants.iter().map(convert_mbx)),
+        }
+    }
+    return acc;
+}
+
+pub fn convert_mbx(addr: &imf::mailbox::MailboxRef) -> Address<'static> {
+    Address {
+        name: NString(
+            addr.name
+                .as_ref()
+                .map(|x| IString::try_from(x.to_string()).unwrap()),
+        ),
+        // SMTP at-domain-list (source route) seems obsolete since at least 1991
+        // https://www.mhonarc.org/archive/html/ietf-822/1991-06/msg00060.html
+        adl: NString(None),
+        mailbox: NString(Some(
+            IString::try_from(addr.addrspec.local_part.to_string()).unwrap(),
+        )),
+        host: NString(Some(
+            IString::try_from(addr.addrspec.domain.to_string()).unwrap(),
+        )),
+    }
+}
diff --git a/aero-proto/src/imap/index.rs b/aero-proto/src/imap/index.rs
new file mode 100644
index 0000000..3de46be
--- /dev/null
+++ b/aero-proto/src/imap/index.rs
@@ -0,0 +1,211 @@
+use std::num::{NonZeroU32, NonZeroU64};
+
+use anyhow::{anyhow, Result};
+use imap_codec::imap_types::sequence::{SeqOrUid, Sequence, SequenceSet};
+
+use aero_collections::mail::uidindex::{ImapUid, ModSeq, UidIndex};
+use aero_collections::mail::unique_ident::UniqueIdent;
+
+pub struct Index<'a> {
+    pub imap_index: Vec<MailIndex<'a>>,
+    pub internal: &'a UidIndex,
+}
+impl<'a> Index<'a> {
+    pub fn new(internal: &'a UidIndex) -> Result<Self> {
+        let imap_index = internal
+            .idx_by_uid
+            .iter()
+            .enumerate()
+            .map(|(i_enum, (&uid, &uuid))| {
+                let (_, modseq, flags) = internal
+                    .table
+                    .get(&uuid)
+                    .ok_or(anyhow!("mail is missing from index"))?;
+                let i_int: u32 = (i_enum + 1).try_into()?;
+                let i: NonZeroU32 = i_int.try_into()?;
+
+                Ok(MailIndex {
+                    i,
+                    uid,
+                    uuid,
+                    modseq: *modseq,
+                    flags,
+                })
+            })
+            .collect::<Result<Vec<_>>>()?;
+
+        Ok(Self {
+            imap_index,
+            internal,
+        })
+    }
+
+    pub fn last(&'a self) -> Option<&'a MailIndex<'a>> {
+        self.imap_index.last()
+    }
+
+    /// Fetch mail descriptors based on a sequence of UID
+    ///
+    /// Complexity analysis:
+    ///  - Sort is O(n * log n) where n is the number of uid generated by the sequence
+    ///  - Finding the starting point in the index O(log m) where m is the size of the mailbox
+    /// While n =< m, it's not clear if the difference is big or not.
+    ///
+    /// For now, the algorithm tries to be fast for small values of n,
+    /// as it is what is expected by clients.
+    ///
+    /// So we assume for our implementation that : n << m.
+    /// It's not true for full mailbox searches for example...
+    pub fn fetch_on_uid(&'a self, sequence_set: &SequenceSet) -> Vec<&'a MailIndex<'a>> {
+        if self.imap_index.is_empty() {
+            return vec![];
+        }
+        let largest = self.last().expect("The mailbox is not empty").uid;
+        let mut unroll_seq = sequence_set.iter(largest).collect::<Vec<_>>();
+        unroll_seq.sort();
+
+        let start_seq = match unroll_seq.iter().next() {
+            Some(elem) => elem,
+            None => return vec![],
+        };
+
+        // Quickly jump to the right point in the mailbox vector O(log m) instead
+        // of iterating one by one O(m). Works only because both unroll_seq & imap_index are sorted per uid.
+        let mut imap_idx = {
+            let start_idx = self
+                .imap_index
+                .partition_point(|mail_idx| &mail_idx.uid < start_seq);
+            &self.imap_index[start_idx..]
+        };
+
+        let mut acc = vec![];
+        for wanted_uid in unroll_seq.iter() {
+            // Slide the window forward as long as its first element is lower than our wanted uid.
+            let start_idx = match imap_idx.iter().position(|midx| &midx.uid >= wanted_uid) {
+                Some(v) => v,
+                None => break,
+            };
+            imap_idx = &imap_idx[start_idx..];
+
+            // If the beginning of our new window is the uid we want, we collect it
+            if &imap_idx[0].uid == wanted_uid {
+                acc.push(&imap_idx[0]);
+            }
+        }
+
+        acc
+    }
+
+    pub fn fetch_on_id(&'a self, sequence_set: &SequenceSet) -> Result<Vec<&'a MailIndex<'a>>> {
+        if self.imap_index.is_empty() {
+            return Ok(vec![]);
+        }
+        let largest = NonZeroU32::try_from(self.imap_index.len() as u32)?;
+        let mut acc = sequence_set
+            .iter(largest)
+            .map(|wanted_id| {
+                self.imap_index
+                    .get((wanted_id.get() as usize) - 1)
+                    .ok_or(anyhow!("Mail not found"))
+            })
+            .collect::<Result<Vec<_>>>()?;
+
+        // Sort the result to be consistent with UID
+        acc.sort_by(|a, b| a.i.cmp(&b.i));
+
+        Ok(acc)
+    }
+
+    pub fn fetch(
+        self: &'a Index<'a>,
+        sequence_set: &SequenceSet,
+        by_uid: bool,
+    ) -> Result<Vec<&'a MailIndex<'a>>> {
+        match by_uid {
+            true => Ok(self.fetch_on_uid(sequence_set)),
+            _ => self.fetch_on_id(sequence_set),
+        }
+    }
+
+    pub fn fetch_changed_since(
+        self: &'a Index<'a>,
+        sequence_set: &SequenceSet,
+        maybe_modseq: Option<NonZeroU64>,
+        by_uid: bool,
+    ) -> Result<Vec<&'a MailIndex<'a>>> {
+        let raw = self.fetch(sequence_set, by_uid)?;
+        let res = match maybe_modseq {
+            Some(pit) => raw.into_iter().filter(|midx| midx.modseq > pit).collect(),
+            None => raw,
+        };
+
+        Ok(res)
+    }
+
+    pub fn fetch_unchanged_since(
+        self: &'a Index<'a>,
+        sequence_set: &SequenceSet,
+        maybe_modseq: Option<NonZeroU64>,
+        by_uid: bool,
+    ) -> Result<(Vec<&'a MailIndex<'a>>, Vec<&'a MailIndex<'a>>)> {
+        let raw = self.fetch(sequence_set, by_uid)?;
+        let res = match maybe_modseq {
+            Some(pit) => raw.into_iter().partition(|midx| midx.modseq <= pit),
+            None => (raw, vec![]),
+        };
+
+        Ok(res)
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct MailIndex<'a> {
+    pub i: NonZeroU32,
+    pub uid: ImapUid,
+    pub uuid: UniqueIdent,
+    pub modseq: ModSeq,
+    pub flags: &'a Vec<String>,
+}
+
+impl<'a> MailIndex<'a> {
+    // The following functions are used to implement the SEARCH command
+    pub fn is_in_sequence_i(&self, seq: &Sequence) -> bool {
+        match seq {
+            Sequence::Single(SeqOrUid::Asterisk) => true,
+            Sequence::Single(SeqOrUid::Value(target)) => target == &self.i,
+            Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Value(x))
+            | Sequence::Range(SeqOrUid::Value(x), SeqOrUid::Asterisk) => x <= &self.i,
+            Sequence::Range(SeqOrUid::Value(x1), SeqOrUid::Value(x2)) => {
+                if x1 < x2 {
+                    x1 <= &self.i && &self.i <= x2
+                } else {
+                    x1 >= &self.i && &self.i >= x2
+                }
+            }
+            Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Asterisk) => true,
+        }
+    }
+
+    pub fn is_in_sequence_uid(&self, seq: &Sequence) -> bool {
+        match seq {
+            Sequence::Single(SeqOrUid::Asterisk) => true,
+            Sequence::Single(SeqOrUid::Value(target)) => target == &self.uid,
+            Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Value(x))
+            | Sequence::Range(SeqOrUid::Value(x), SeqOrUid::Asterisk) => x <= &self.uid,
+            Sequence::Range(SeqOrUid::Value(x1), SeqOrUid::Value(x2)) => {
+                if x1 < x2 {
+                    x1 <= &self.uid && &self.uid <= x2
+                } else {
+                    x1 >= &self.uid && &self.uid >= x2
+                }
+            }
+            Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Asterisk) => true,
+        }
+    }
+
+    pub fn is_flag_set(&self, flag: &str) -> bool {
+        self.flags
+            .iter()
+            .any(|candidate| candidate.as_str() == flag)
+    }
+}
diff --git a/aero-proto/src/imap/mail_view.rs b/aero-proto/src/imap/mail_view.rs
new file mode 100644
index 0000000..054014a
--- /dev/null
+++ b/aero-proto/src/imap/mail_view.rs
@@ -0,0 +1,306 @@
+use std::num::NonZeroU32;
+
+use anyhow::{anyhow, bail, Result};
+use chrono::{naive::NaiveDate, DateTime as ChronoDateTime, Local, Offset, TimeZone, Utc};
+
+use imap_codec::imap_types::core::NString;
+use imap_codec::imap_types::datetime::DateTime;
+use imap_codec::imap_types::fetch::{
+    MessageDataItem, MessageDataItemName, Section as FetchSection,
+};
+use imap_codec::imap_types::flag::Flag;
+use imap_codec::imap_types::response::Data;
+
+use eml_codec::{
+    imf,
+    part::{composite::Message, AnyPart},
+};
+
+use aero_collections::mail::query::QueryResult;
+
+use crate::imap::attributes::AttributesProxy;
+use crate::imap::flags;
+use crate::imap::imf_view::ImfView;
+use crate::imap::index::MailIndex;
+use crate::imap::mime_view;
+use crate::imap::response::Body;
+
+pub struct MailView<'a> {
+    pub in_idx: &'a MailIndex<'a>,
+    pub query_result: &'a QueryResult,
+    pub content: FetchedMail<'a>,
+}
+
+impl<'a> MailView<'a> {
+    pub fn new(query_result: &'a QueryResult, in_idx: &'a MailIndex<'a>) -> Result<MailView<'a>> {
+        Ok(Self {
+            in_idx,
+            query_result,
+            content: match query_result {
+                QueryResult::FullResult { content, .. } => {
+                    let (_, parsed) =
+                        eml_codec::parse_message(&content).or(Err(anyhow!("Invalid mail body")))?;
+                    FetchedMail::full_from_message(parsed)
+                }
+                QueryResult::PartialResult { metadata, .. } => {
+                    let (_, parsed) = eml_codec::parse_message(&metadata.headers)
+                        .or(Err(anyhow!("unable to parse email headers")))?;
+                    FetchedMail::partial_from_message(parsed)
+                }
+                QueryResult::IndexResult { .. } => FetchedMail::IndexOnly,
+            },
+        })
+    }
+
+    pub fn imf(&self) -> Option<ImfView> {
+        self.content.as_imf().map(ImfView)
+    }
+
+    pub fn selected_mime(&'a self) -> Option<mime_view::SelectedMime<'a>> {
+        self.content.as_anypart().ok().map(mime_view::SelectedMime)
+    }
+
+    pub fn filter(&self, ap: &AttributesProxy) -> Result<(Body<'static>, SeenFlag)> {
+        let mut seen = SeenFlag::DoNothing;
+        let res_attrs = ap
+            .attrs
+            .iter()
+            .map(|attr| match attr {
+                MessageDataItemName::Uid => Ok(self.uid()),
+                MessageDataItemName::Flags => Ok(self.flags()),
+                MessageDataItemName::Rfc822Size => self.rfc_822_size(),
+                MessageDataItemName::Rfc822Header => self.rfc_822_header(),
+                MessageDataItemName::Rfc822Text => self.rfc_822_text(),
+                MessageDataItemName::Rfc822 => {
+                    if self.is_not_yet_seen() {
+                        seen = SeenFlag::MustAdd;
+                    }
+                    self.rfc822()
+                }
+                MessageDataItemName::Envelope => Ok(self.envelope()),
+                MessageDataItemName::Body => self.body(),
+                MessageDataItemName::BodyStructure => self.body_structure(),
+                MessageDataItemName::BodyExt {
+                    section,
+                    partial,
+                    peek,
+                } => {
+                    let (body, has_seen) = self.body_ext(section, partial, peek)?;
+                    seen = has_seen;
+                    Ok(body)
+                }
+                MessageDataItemName::InternalDate => self.internal_date(),
+                MessageDataItemName::ModSeq => Ok(self.modseq()),
+            })
+            .collect::<Result<Vec<_>, _>>()?;
+
+        Ok((
+            Body::Data(Data::Fetch {
+                seq: self.in_idx.i,
+                items: res_attrs.try_into()?,
+            }),
+            seen,
+        ))
+    }
+
+    pub fn stored_naive_date(&self) -> Result<NaiveDate> {
+        let mail_meta = self.query_result.metadata().expect("metadata were fetched");
+        let mail_ts: i64 = mail_meta.internaldate.try_into()?;
+        let msg_date: ChronoDateTime<Local> = ChronoDateTime::from_timestamp(mail_ts, 0)
+            .ok_or(anyhow!("unable to parse timestamp"))?
+            .with_timezone(&Local);
+
+        Ok(msg_date.date_naive())
+    }
+
+    pub fn is_header_contains_pattern(&self, hdr: &[u8], pattern: &[u8]) -> bool {
+        let mime = match self.selected_mime() {
+            None => return false,
+            Some(x) => x,
+        };
+
+        let val = match mime.header_value(hdr) {
+            None => return false,
+            Some(x) => x,
+        };
+
+        val.windows(pattern.len()).any(|win| win == pattern)
+    }
+
+    // Private function, mainly for filter!
+    fn uid(&self) -> MessageDataItem<'static> {
+        MessageDataItem::Uid(self.in_idx.uid.clone())
+    }
+
+    fn flags(&self) -> MessageDataItem<'static> {
+        MessageDataItem::Flags(
+            self.in_idx
+                .flags
+                .iter()
+                .filter_map(|f| flags::from_str(f))
+                .collect(),
+        )
+    }
+
+    fn rfc_822_size(&self) -> Result<MessageDataItem<'static>> {
+        let sz = self
+            .query_result
+            .metadata()
+            .ok_or(anyhow!("mail metadata are required"))?
+            .rfc822_size;
+        Ok(MessageDataItem::Rfc822Size(sz as u32))
+    }
+
+    fn rfc_822_header(&self) -> Result<MessageDataItem<'static>> {
+        let hdrs: NString = self
+            .query_result
+            .metadata()
+            .ok_or(anyhow!("mail metadata are required"))?
+            .headers
+            .to_vec()
+            .try_into()?;
+        Ok(MessageDataItem::Rfc822Header(hdrs))
+    }
+
+    fn rfc_822_text(&self) -> Result<MessageDataItem<'static>> {
+        let txt: NString = self.content.as_msg()?.raw_body.to_vec().try_into()?;
+        Ok(MessageDataItem::Rfc822Text(txt))
+    }
+
+    fn rfc822(&self) -> Result<MessageDataItem<'static>> {
+        let full: NString = self.content.as_msg()?.raw_part.to_vec().try_into()?;
+        Ok(MessageDataItem::Rfc822(full))
+    }
+
+    fn envelope(&self) -> MessageDataItem<'static> {
+        MessageDataItem::Envelope(
+            self.imf()
+                .expect("an imf object is derivable from fetchedmail")
+                .message_envelope(),
+        )
+    }
+
+    fn body(&self) -> Result<MessageDataItem<'static>> {
+        Ok(MessageDataItem::Body(mime_view::bodystructure(
+            self.content.as_msg()?.child.as_ref(),
+            false,
+        )?))
+    }
+
+    fn body_structure(&self) -> Result<MessageDataItem<'static>> {
+        Ok(MessageDataItem::BodyStructure(mime_view::bodystructure(
+            self.content.as_msg()?.child.as_ref(),
+            true,
+        )?))
+    }
+
+    fn is_not_yet_seen(&self) -> bool {
+        let seen_flag = Flag::Seen.to_string();
+        !self.in_idx.flags.iter().any(|x| *x == seen_flag)
+    }
+
+    /// maps to BODY[<section>]<<partial>> and BODY.PEEK[<section>]<<partial>>
+    /// peek does not implicitly set the \Seen flag
+    /// eg. BODY[HEADER.FIELDS (DATE FROM)]
+    /// eg. BODY[]<0.2048>
+    fn body_ext(
+        &self,
+        section: &Option<FetchSection<'static>>,
+        partial: &Option<(u32, NonZeroU32)>,
+        peek: &bool,
+    ) -> Result<(MessageDataItem<'static>, SeenFlag)> {
+        // Manage Seen flag
+        let mut seen = SeenFlag::DoNothing;
+        if !peek && self.is_not_yet_seen() {
+            // Add \Seen flag
+            //self.mailbox.add_flags(uuid, &[seen_flag]).await?;
+            seen = SeenFlag::MustAdd;
+        }
+
+        // Process message
+        let (text, origin) =
+            match mime_view::body_ext(self.content.as_anypart()?, section, partial)? {
+                mime_view::BodySection::Full(body) => (body, None),
+                mime_view::BodySection::Slice { body, origin_octet } => (body, Some(origin_octet)),
+            };
+
+        let data: NString = text.to_vec().try_into()?;
+
+        return Ok((
+            MessageDataItem::BodyExt {
+                section: section.as_ref().map(|fs| fs.clone()),
+                origin,
+                data,
+            },
+            seen,
+        ));
+    }
+
+    fn internal_date(&self) -> Result<MessageDataItem<'static>> {
+        let dt = Utc
+            .fix()
+            .timestamp_opt(
+                i64::try_from(
+                    self.query_result
+                        .metadata()
+                        .ok_or(anyhow!("mail metadata were not fetched"))?
+                        .internaldate
+                        / 1000,
+                )?,
+                0,
+            )
+            .earliest()
+            .ok_or(anyhow!("Unable to parse internal date"))?;
+        Ok(MessageDataItem::InternalDate(DateTime::unvalidated(dt)))
+    }
+
+    fn modseq(&self) -> MessageDataItem<'static> {
+        MessageDataItem::ModSeq(self.in_idx.modseq)
+    }
+}
+
+pub enum SeenFlag {
+    DoNothing,
+    MustAdd,
+}
+
+// -------------------
+
+pub enum FetchedMail<'a> {
+    IndexOnly,
+    Partial(AnyPart<'a>),
+    Full(AnyPart<'a>),
+}
+impl<'a> FetchedMail<'a> {
+    pub fn full_from_message(msg: Message<'a>) -> Self {
+        Self::Full(AnyPart::Msg(msg))
+    }
+
+    pub fn partial_from_message(msg: Message<'a>) -> Self {
+        Self::Partial(AnyPart::Msg(msg))
+    }
+
+    pub fn as_anypart(&self) -> Result<&AnyPart<'a>> {
+        match self {
+            FetchedMail::Full(x) => Ok(&x),
+            FetchedMail::Partial(x) => Ok(&x),
+            _ => bail!("The full message must be fetched, not only its headers"),
+        }
+    }
+
+    pub fn as_msg(&self) -> Result<&Message<'a>> {
+        match self {
+            FetchedMail::Full(AnyPart::Msg(x)) => Ok(&x),
+            FetchedMail::Partial(AnyPart::Msg(x)) => Ok(&x),
+            _ => bail!("The full message must be fetched, not only its headers AND it must be an AnyPart::Msg."),
+        }
+    }
+
+    pub fn as_imf(&self) -> Option<&imf::Imf<'a>> {
+        match self {
+            FetchedMail::Full(AnyPart::Msg(x)) => Some(&x.imf),
+            FetchedMail::Partial(AnyPart::Msg(x)) => Some(&x.imf),
+            _ => None,
+        }
+    }
+}
diff --git a/aero-proto/src/imap/mailbox_view.rs b/aero-proto/src/imap/mailbox_view.rs
new file mode 100644
index 0000000..5154359
--- /dev/null
+++ b/aero-proto/src/imap/mailbox_view.rs
@@ -0,0 +1,772 @@
+use std::collections::HashSet;
+use std::num::{NonZeroU32, NonZeroU64};
+use std::sync::Arc;
+
+use anyhow::{anyhow, Error, Result};
+
+use futures::stream::{StreamExt, TryStreamExt};
+
+use imap_codec::imap_types::core::Charset;
+use imap_codec::imap_types::fetch::MessageDataItem;
+use imap_codec::imap_types::flag::{Flag, FlagFetch, FlagPerm, StoreResponse, StoreType};
+use imap_codec::imap_types::response::{Code, CodeOther, Data, Status};
+use imap_codec::imap_types::search::SearchKey;
+use imap_codec::imap_types::sequence::SequenceSet;
+
+use aero_collections::mail::mailbox::Mailbox;
+use aero_collections::mail::query::QueryScope;
+use aero_collections::mail::snapshot::FrozenMailbox;
+use aero_collections::mail::uidindex::{ImapUid, ImapUidvalidity, ModSeq};
+use aero_collections::mail::unique_ident::UniqueIdent;
+
+use crate::imap::attributes::AttributesProxy;
+use crate::imap::flags;
+use crate::imap::index::Index;
+use crate::imap::mail_view::{MailView, SeenFlag};
+use crate::imap::response::Body;
+use crate::imap::search;
+
+const DEFAULT_FLAGS: [Flag; 5] = [
+    Flag::Seen,
+    Flag::Answered,
+    Flag::Flagged,
+    Flag::Deleted,
+    Flag::Draft,
+];
+
+pub struct UpdateParameters {
+    pub silence: HashSet<UniqueIdent>,
+    pub with_modseq: bool,
+    pub with_uid: bool,
+}
+impl Default for UpdateParameters {
+    fn default() -> Self {
+        Self {
+            silence: HashSet::new(),
+            with_modseq: false,
+            with_uid: false,
+        }
+    }
+}
+
+/// A MailboxView is responsible for giving the client the information
+/// it needs about a mailbox, such as an initial summary of the mailbox's
+/// content and continuous updates indicating when the content
+/// of the mailbox has been changed.
+/// To do this, it keeps a variable `known_state` that corresponds to
+/// what the client knows, and produces IMAP messages to be sent to the
+/// client that go along updates to `known_state`.
+pub struct MailboxView {
+    pub internal: FrozenMailbox,
+    pub is_condstore: bool,
+}
+
+impl MailboxView {
+    /// Creates a new IMAP view into a mailbox.
+    pub async fn new(mailbox: Arc<Mailbox>, is_cond: bool) -> Self {
+        Self {
+            internal: mailbox.frozen().await,
+            is_condstore: is_cond,
+        }
+    }
+
+    /// Create an updated view, useful to make a diff
+    /// between what the client knows and new stuff
+    /// Produces a set of IMAP responses describing the change between
+    /// what the client knows and what is actually in the mailbox.
+    /// This does NOT trigger a sync, it bases itself on what is currently
+    /// loaded in RAM by Bayou.
+    pub async fn update(&mut self, params: UpdateParameters) -> Result<Vec<Body<'static>>> {
+        let old_snapshot = self.internal.update().await;
+        let new_snapshot = &self.internal.snapshot;
+
+        let mut data = Vec::<Body>::new();
+
+        // Calculate diff between two mailbox states
+        // See example in IMAP RFC in section on NOOP command:
+        // we want to produce something like this:
+        // C: a047 NOOP
+        // S: * 22 EXPUNGE
+        // S: * 23 EXISTS
+        // S: * 14 FETCH (UID 1305 FLAGS (\Seen \Deleted))
+        // S: a047 OK Noop completed
+        // In other words:
+        // - notify client of expunged mails
+        // - if new mails arrived, notify client of number of existing mails
+        // - if flags changed for existing mails, tell client
+        //   (for this last step: if uidvalidity changed, do nothing,
+        //   just notify of new uidvalidity and they will resync)
+
+        // - notify client of expunged mails
+        let mut n_expunge = 0;
+        for (i, (_uid, uuid)) in old_snapshot.idx_by_uid.iter().enumerate() {
+            if !new_snapshot.table.contains_key(uuid) {
+                data.push(Body::Data(Data::Expunge(
+                    NonZeroU32::try_from((i + 1 - n_expunge) as u32).unwrap(),
+                )));
+                n_expunge += 1;
+            }
+        }
+
+        // - if new mails arrived, notify client of number of existing mails
+        if new_snapshot.table.len() != old_snapshot.table.len() - n_expunge
+            || new_snapshot.uidvalidity != old_snapshot.uidvalidity
+        {
+            data.push(self.exists_status()?);
+        }
+
+        if new_snapshot.uidvalidity != old_snapshot.uidvalidity {
+            // TODO: do we want to push less/more info than this?
+            data.push(self.uidvalidity_status()?);
+            data.push(self.uidnext_status()?);
+        } else {
+            // - if flags changed for existing mails, tell client
+            for (i, (_uid, uuid)) in new_snapshot.idx_by_uid.iter().enumerate() {
+                if params.silence.contains(uuid) {
+                    continue;
+                }
+
+                let old_mail = old_snapshot.table.get(uuid);
+                let new_mail = new_snapshot.table.get(uuid);
+                if old_mail.is_some() && old_mail != new_mail {
+                    if let Some((uid, modseq, flags)) = new_mail {
+                        let mut items = vec![MessageDataItem::Flags(
+                            flags.iter().filter_map(|f| flags::from_str(f)).collect(),
+                        )];
+
+                        if params.with_uid {
+                            items.push(MessageDataItem::Uid(*uid));
+                        }
+
+                        if params.with_modseq {
+                            items.push(MessageDataItem::ModSeq(*modseq));
+                        }
+
+                        data.push(Body::Data(Data::Fetch {
+                            seq: NonZeroU32::try_from((i + 1) as u32).unwrap(),
+                            items: items.try_into()?,
+                        }));
+                    }
+                }
+            }
+        }
+        Ok(data)
+    }
+
+    /// Generates the necessary IMAP messages so that the client
+    /// has a satisfactory summary of the current mailbox's state.
+    /// These are the messages that are sent in response to a SELECT command.
+    pub fn summary(&self) -> Result<Vec<Body<'static>>> {
+        let mut data = Vec::<Body>::new();
+        data.push(self.exists_status()?);
+        data.push(self.recent_status()?);
+        data.extend(self.flags_status()?.into_iter());
+        data.push(self.uidvalidity_status()?);
+        data.push(self.uidnext_status()?);
+        if self.is_condstore {
+            data.push(self.highestmodseq_status()?);
+        }
+        /*self.unseen_first_status()?
+        .map(|unseen_status| data.push(unseen_status));*/
+
+        Ok(data)
+    }
+
+    pub async fn store<'a>(
+        &mut self,
+        sequence_set: &SequenceSet,
+        kind: &StoreType,
+        response: &StoreResponse,
+        flags: &[Flag<'a>],
+        unchanged_since: Option<NonZeroU64>,
+        is_uid_store: &bool,
+    ) -> Result<(Vec<Body<'static>>, Vec<NonZeroU32>)> {
+        self.internal.sync().await?;
+
+        let flags = flags.iter().map(|x| x.to_string()).collect::<Vec<_>>();
+
+        let idx = self.index()?;
+        let (editable, in_conflict) =
+            idx.fetch_unchanged_since(sequence_set, unchanged_since, *is_uid_store)?;
+
+        for mi in editable.iter() {
+            match kind {
+                StoreType::Add => {
+                    self.internal.mailbox.add_flags(mi.uuid, &flags[..]).await?;
+                }
+                StoreType::Remove => {
+                    self.internal.mailbox.del_flags(mi.uuid, &flags[..]).await?;
+                }
+                StoreType::Replace => {
+                    self.internal.mailbox.set_flags(mi.uuid, &flags[..]).await?;
+                }
+            }
+        }
+
+        let silence = match response {
+            StoreResponse::Answer => HashSet::new(),
+            StoreResponse::Silent => editable.iter().map(|midx| midx.uuid).collect(),
+        };
+
+        let conflict_id_or_uid = match is_uid_store {
+            true => in_conflict.into_iter().map(|midx| midx.uid).collect(),
+            _ => in_conflict.into_iter().map(|midx| midx.i).collect(),
+        };
+
+        let summary = self
+            .update(UpdateParameters {
+                with_uid: *is_uid_store,
+                with_modseq: unchanged_since.is_some(),
+                silence,
+            })
+            .await?;
+
+        Ok((summary, conflict_id_or_uid))
+    }
+
+    pub async fn idle_sync(&mut self) -> Result<Vec<Body<'static>>> {
+        self.internal
+            .mailbox
+            .notify()
+            .await
+            .upgrade()
+            .ok_or(anyhow!("test"))?
+            .notified()
+            .await;
+        self.internal.mailbox.opportunistic_sync().await?;
+        self.update(UpdateParameters::default()).await
+    }
+
+    pub async fn expunge(
+        &mut self,
+        maybe_seq_set: &Option<SequenceSet>,
+    ) -> Result<Vec<Body<'static>>> {
+        // Get a recent view to apply our change
+        self.internal.sync().await?;
+        let state = self.internal.peek().await;
+        let idx = Index::new(&state)?;
+
+        // Build a default sequence set for the default case
+        use imap_codec::imap_types::sequence::{SeqOrUid, Sequence};
+        let seq = match maybe_seq_set {
+            Some(s) => s.clone(),
+            None => SequenceSet(
+                vec![Sequence::Range(
+                    SeqOrUid::Value(NonZeroU32::MIN),
+                    SeqOrUid::Asterisk,
+                )]
+                .try_into()
+                .unwrap(),
+            ),
+        };
+
+        let deleted_flag = Flag::Deleted.to_string();
+        let msgs = idx
+            .fetch_on_uid(&seq)
+            .into_iter()
+            .filter(|midx| midx.flags.iter().any(|x| *x == deleted_flag))
+            .map(|midx| midx.uuid);
+
+        for msg in msgs {
+            self.internal.mailbox.delete(msg).await?;
+        }
+
+        self.update(UpdateParameters::default()).await
+    }
+
+    pub async fn copy(
+        &self,
+        sequence_set: &SequenceSet,
+        to: Arc<Mailbox>,
+        is_uid_copy: &bool,
+    ) -> Result<(ImapUidvalidity, Vec<(ImapUid, ImapUid)>)> {
+        let idx = self.index()?;
+        let mails = idx.fetch(sequence_set, *is_uid_copy)?;
+
+        let mut new_uuids = vec![];
+        for mi in mails.iter() {
+            new_uuids.push(to.copy_from(&self.internal.mailbox, mi.uuid).await?);
+        }
+
+        let mut ret = vec![];
+        let to_state = to.current_uid_index().await;
+        for (mi, new_uuid) in mails.iter().zip(new_uuids.iter()) {
+            let dest_uid = to_state
+                .table
+                .get(new_uuid)
+                .ok_or(anyhow!("copied mail not in destination mailbox"))?
+                .0;
+            ret.push((mi.uid, dest_uid));
+        }
+
+        Ok((to_state.uidvalidity, ret))
+    }
+
+    pub async fn r#move(
+        &mut self,
+        sequence_set: &SequenceSet,
+        to: Arc<Mailbox>,
+        is_uid_copy: &bool,
+    ) -> Result<(ImapUidvalidity, Vec<(ImapUid, ImapUid)>, Vec<Body<'static>>)> {
+        let idx = self.index()?;
+        let mails = idx.fetch(sequence_set, *is_uid_copy)?;
+
+        for mi in mails.iter() {
+            to.move_from(&self.internal.mailbox, mi.uuid).await?;
+        }
+
+        let mut ret = vec![];
+        let to_state = to.current_uid_index().await;
+        for mi in mails.iter() {
+            let dest_uid = to_state
+                .table
+                .get(&mi.uuid)
+                .ok_or(anyhow!("moved mail not in destination mailbox"))?
+                .0;
+            ret.push((mi.uid, dest_uid));
+        }
+
+        let update = self
+            .update(UpdateParameters {
+                with_uid: *is_uid_copy,
+                ..UpdateParameters::default()
+            })
+            .await?;
+
+        Ok((to_state.uidvalidity, ret, update))
+    }
+
+    /// Looks up state changes in the mailbox and produces a set of IMAP
+    /// responses describing the new state.
+    pub async fn fetch<'b>(
+        &self,
+        sequence_set: &SequenceSet,
+        ap: &AttributesProxy,
+        changed_since: Option<NonZeroU64>,
+        is_uid_fetch: &bool,
+    ) -> Result<Vec<Body<'static>>> {
+        // [1/6] Pre-compute data
+        //  a. what are the uuids of the emails we want?
+        //  b. do we need to fetch the full body?
+        //let ap = AttributesProxy::new(attributes, *is_uid_fetch);
+        let query_scope = match ap.need_body() {
+            true => QueryScope::Full,
+            _ => QueryScope::Partial,
+        };
+        tracing::debug!("Query scope {:?}", query_scope);
+        let idx = self.index()?;
+        let mail_idx_list = idx.fetch_changed_since(sequence_set, changed_since, *is_uid_fetch)?;
+
+        // [2/6] Fetch the emails
+        let uuids = mail_idx_list
+            .iter()
+            .map(|midx| midx.uuid)
+            .collect::<Vec<_>>();
+
+        let query = self.internal.query(&uuids, query_scope);
+        //let query_result = self.internal.query(&uuids, query_scope).fetch().await?;
+
+        let query_stream = query
+            .fetch()
+            .zip(futures::stream::iter(mail_idx_list))
+            // [3/6] Derive an IMAP-specific view from the results, apply the filters
+            .map(|(maybe_qr, midx)| match maybe_qr {
+                Ok(qr) => Ok((MailView::new(&qr, midx)?.filter(&ap)?, midx)),
+                Err(e) => Err(e),
+            })
+            // [4/6] Apply the IMAP transformation
+            .then(|maybe_ret| async move {
+                let ((body, seen), midx) = maybe_ret?;
+
+                // [5/6] Register the \Seen flags
+                if matches!(seen, SeenFlag::MustAdd) {
+                    let seen_flag = Flag::Seen.to_string();
+                    self.internal
+                        .mailbox
+                        .add_flags(midx.uuid, &[seen_flag])
+                        .await?;
+                }
+
+                Ok::<_, anyhow::Error>(body)
+            });
+
+        // [6/6] Build the final result that will be sent to the client.
+        query_stream.try_collect().await
+    }
+
+    /// A naive search implementation...
+    pub async fn search<'a>(
+        &self,
+        _charset: &Option<Charset<'a>>,
+        search_key: &SearchKey<'a>,
+        uid: bool,
+    ) -> Result<(Vec<Body<'static>>, bool)> {
+        // 1. Compute the subset of sequence identifiers we need to fetch
+        // based on the search query
+        let crit = search::Criteria(search_key);
+        let (seq_set, seq_type) = crit.to_sequence_set();
+
+        // 2. Get the selection
+        let idx = self.index()?;
+        let selection = idx.fetch(&seq_set, seq_type.is_uid())?;
+
+        // 3. Filter the selection based on the ID / UID / Flags
+        let (kept_idx, to_fetch) = crit.filter_on_idx(&selection);
+
+        // 4.a Fetch additional info about the emails
+        let query_scope = crit.query_scope();
+        let uuids = to_fetch.iter().map(|midx| midx.uuid).collect::<Vec<_>>();
+        let query = self.internal.query(&uuids, query_scope);
+
+        // 4.b We don't want to keep all data in memory, so we do the computing in a stream
+        let query_stream = query
+            .fetch()
+            .zip(futures::stream::iter(&to_fetch))
+            // 5.a Build a mailview with the body, might fail with an error
+            // 5.b If needed, filter the selection based on the body, but keep the errors
+            // 6. Drop the query+mailbox, keep only the mail index
+            // Here we release a lot of memory, this is the most important part ^^
+            .filter_map(|(maybe_qr, midx)| {
+                let r = match maybe_qr {
+                    Ok(qr) => match MailView::new(&qr, midx).map(|mv| crit.is_keep_on_query(&mv)) {
+                        Ok(true) => Some(Ok(*midx)),
+                        Ok(_) => None,
+                        Err(e) => Some(Err(e)),
+                    },
+                    Err(e) => Some(Err(e)),
+                };
+                futures::future::ready(r)
+            });
+
+        // 7. Chain both streams (part resolved from index, part resolved from metadata+body)
+        let main_stream = futures::stream::iter(kept_idx)
+            .map(Ok)
+            .chain(query_stream)
+            .map_ok(|idx| match uid {
+                true => (idx.uid, idx.modseq),
+                _ => (idx.i, idx.modseq),
+            });
+
+        // 8. Do the actual computation
+        let internal_result: Vec<_> = main_stream.try_collect().await?;
+        let (selection, modseqs): (Vec<_>, Vec<_>) = internal_result.into_iter().unzip();
+
+        // 9. Aggregate the maximum modseq value
+        let maybe_modseq = match crit.is_modseq() {
+            true => modseqs.into_iter().max(),
+            _ => None,
+        };
+
+        // 10. Return the final result
+        Ok((
+            vec![Body::Data(Data::Search(selection, maybe_modseq))],
+            maybe_modseq.is_some(),
+        ))
+    }
+
+    // ----
+    /// @FIXME index should be stored for longer than a single request
+    /// Instead they should be tied to the FrozenMailbox refresh
+    /// It's not trivial to refactor the code to do that, so we are doing
+    /// some useless computation for now...
+    fn index<'a>(&'a self) -> Result<Index<'a>> {
+        Index::new(&self.internal.snapshot)
+    }
+
+    /// Produce an OK [UIDVALIDITY _] message corresponding to `known_state`
+    fn uidvalidity_status(&self) -> Result<Body<'static>> {
+        let uid_validity = Status::ok(
+            None,
+            Some(Code::UidValidity(self.uidvalidity())),
+            "UIDs valid",
+        )
+        .map_err(Error::msg)?;
+        Ok(Body::Status(uid_validity))
+    }
+
+    pub(crate) fn uidvalidity(&self) -> ImapUidvalidity {
+        self.internal.snapshot.uidvalidity
+    }
+
+    /// Produce an OK [UIDNEXT _] message corresponding to `known_state`
+    fn uidnext_status(&self) -> Result<Body<'static>> {
+        let next_uid = Status::ok(
+            None,
+            Some(Code::UidNext(self.uidnext())),
+            "Predict next UID",
+        )
+        .map_err(Error::msg)?;
+        Ok(Body::Status(next_uid))
+    }
+
+    pub(crate) fn uidnext(&self) -> ImapUid {
+        self.internal.snapshot.uidnext
+    }
+
+    pub(crate) fn highestmodseq_status(&self) -> Result<Body<'static>> {
+        Ok(Body::Status(Status::ok(
+            None,
+            Some(Code::Other(CodeOther::unvalidated(
+                format!("HIGHESTMODSEQ {}", self.highestmodseq()).into_bytes(),
+            ))),
+            "Highest",
+        )?))
+    }
+
+    pub(crate) fn highestmodseq(&self) -> ModSeq {
+        self.internal.snapshot.highestmodseq
+    }
+
+    /// Produce an EXISTS message corresponding to the number of mails
+    /// in `known_state`
+    fn exists_status(&self) -> Result<Body<'static>> {
+        Ok(Body::Data(Data::Exists(self.exists()?)))
+    }
+
+    pub(crate) fn exists(&self) -> Result<u32> {
+        Ok(u32::try_from(self.internal.snapshot.idx_by_uid.len())?)
+    }
+
+    /// Produce a RECENT message corresponding to the number of
+    /// recent mails in `known_state`
+    fn recent_status(&self) -> Result<Body<'static>> {
+        Ok(Body::Data(Data::Recent(self.recent()?)))
+    }
+
+    #[allow(dead_code)]
+    fn unseen_first_status(&self) -> Result<Option<Body<'static>>> {
+        Ok(self
+            .unseen_first()?
+            .map(|unseen_id| {
+                Status::ok(None, Some(Code::Unseen(unseen_id)), "First unseen.").map(Body::Status)
+            })
+            .transpose()?)
+    }
+
+    #[allow(dead_code)]
+    fn unseen_first(&self) -> Result<Option<NonZeroU32>> {
+        Ok(self
+            .internal
+            .snapshot
+            .table
+            .values()
+            .enumerate()
+            .find(|(_i, (_imap_uid, _modseq, flags))| !flags.contains(&"\\Seen".to_string()))
+            .map(|(i, _)| NonZeroU32::try_from(i as u32 + 1))
+            .transpose()?)
+    }
+
+    pub(crate) fn recent(&self) -> Result<u32> {
+        let recent = self
+            .internal
+            .snapshot
+            .idx_by_flag
+            .get(&"\\Recent".to_string())
+            .map(|os| os.len())
+            .unwrap_or(0);
+        Ok(u32::try_from(recent)?)
+    }
+
+    /// Produce a FLAGS and a PERMANENTFLAGS message that indicates
+    /// the flags that are in `known_state` + default flags
+    fn flags_status(&self) -> Result<Vec<Body<'static>>> {
+        let mut body = vec![];
+
+        // 1. Collecting all the possible flags in the mailbox
+        // 1.a Fetch them from our index
+        let mut known_flags: Vec<Flag> = self
+            .internal
+            .snapshot
+            .idx_by_flag
+            .flags()
+            .filter_map(|f| match flags::from_str(f) {
+                Some(FlagFetch::Flag(fl)) => Some(fl),
+                _ => None,
+            })
+            .collect();
+        // 1.b Merge it with our default flags list
+        for f in DEFAULT_FLAGS.iter() {
+            if !known_flags.contains(f) {
+                known_flags.push(f.clone());
+            }
+        }
+        // 1.c Create the IMAP message
+        body.push(Body::Data(Data::Flags(known_flags.clone())));
+
+        // 2. Returning flags that are persisted
+        // 2.a Always advertise our default flags
+        let mut permanent = DEFAULT_FLAGS
+            .iter()
+            .map(|f| FlagPerm::Flag(f.clone()))
+            .collect::<Vec<_>>();
+        // 2.b Say that we support any keyword flag
+        permanent.push(FlagPerm::Asterisk);
+        // 2.c Create the IMAP message
+        let permanent_flags = Status::ok(
+            None,
+            Some(Code::PermanentFlags(permanent)),
+            "Flags permitted",
+        )
+        .map_err(Error::msg)?;
+        body.push(Body::Status(permanent_flags));
+
+        // Done!
+        Ok(body)
+    }
+
+    pub(crate) fn unseen_count(&self) -> usize {
+        let total = self.internal.snapshot.table.len();
+        let seen = self
+            .internal
+            .snapshot
+            .idx_by_flag
+            .get(&Flag::Seen.to_string())
+            .map(|x| x.len())
+            .unwrap_or(0);
+        total - seen
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use imap_codec::encode::Encoder;
+    use imap_codec::imap_types::core::Vec1;
+    use imap_codec::imap_types::fetch::Section;
+    use imap_codec::imap_types::fetch::{MacroOrMessageDataItemNames, MessageDataItemName};
+    use imap_codec::imap_types::response::Response;
+    use imap_codec::ResponseCodec;
+    use std::fs;
+
+    use crate::cryptoblob;
+    use crate::imap::index::MailIndex;
+    use crate::imap::mail_view::MailView;
+    use crate::imap::mime_view;
+    use crate::mail::mailbox::MailMeta;
+    use crate::mail::query::QueryResult;
+    use crate::mail::unique_ident;
+
+    #[test]
+    fn mailview_body_ext() -> Result<()> {
+        let ap = AttributesProxy::new(
+            &MacroOrMessageDataItemNames::MessageDataItemNames(vec![
+                MessageDataItemName::BodyExt {
+                    section: Some(Section::Header(None)),
+                    partial: None,
+                    peek: false,
+                },
+            ]),
+            &[],
+            false,
+        );
+
+        let key = cryptoblob::gen_key();
+        let meta = MailMeta {
+            internaldate: 0u64,
+            headers: vec![],
+            message_key: key,
+            rfc822_size: 8usize,
+        };
+
+        let index_entry = (NonZeroU32::MIN, NonZeroU64::MIN, vec![]);
+        let mail_in_idx = MailIndex {
+            i: NonZeroU32::MIN,
+            uid: index_entry.0,
+            modseq: index_entry.1,
+            uuid: unique_ident::gen_ident(),
+            flags: &index_entry.2,
+        };
+        let rfc822 = b"Subject: hello\r\nFrom: a@a.a\r\nTo: b@b.b\r\nDate: Thu, 12 Oct 2023 08:45:28 +0000\r\n\r\nhello world";
+        let qr = QueryResult::FullResult {
+            uuid: mail_in_idx.uuid.clone(),
+            metadata: meta,
+            content: rfc822.to_vec(),
+        };
+
+        let mv = MailView::new(&qr, &mail_in_idx)?;
+        let (res_body, _seen) = mv.filter(&ap)?;
+
+        let fattr = match res_body {
+            Body::Data(Data::Fetch {
+                seq: _seq,
+                items: attr,
+            }) => Ok(attr),
+            _ => Err(anyhow!("Not a fetch body")),
+        }?;
+
+        assert_eq!(fattr.as_ref().len(), 1);
+
+        let (sec, _orig, _data) = match &fattr.as_ref()[0] {
+            MessageDataItem::BodyExt {
+                section,
+                origin,
+                data,
+            } => Ok((section, origin, data)),
+            _ => Err(anyhow!("not a body ext message attribute")),
+        }?;
+
+        assert_eq!(sec.as_ref().unwrap(), &Section::Header(None));
+
+        Ok(())
+    }
+
+    /// Future automated test. We use lossy utf8 conversion + lowercase everything,
+    /// so this test might allow invalid results. But at least it allows us to quickly test a
+    /// large variety of emails.
+    /// Keep in mind that special cases must still be tested manually!
+    #[test]
+    fn fetch_body() -> Result<()> {
+        let prefixes = [
+            /* *** MY OWN DATASET *** */
+            "tests/emails/dxflrs/0001_simple",
+            "tests/emails/dxflrs/0002_mime",
+            "tests/emails/dxflrs/0003_mime-in-mime",
+            "tests/emails/dxflrs/0004_msg-in-msg",
+            // eml_codec do not support continuation for the moment
+            //"tests/emails/dxflrs/0005_mail-parser-readme",
+            "tests/emails/dxflrs/0006_single-mime",
+            "tests/emails/dxflrs/0007_raw_msg_in_rfc822",
+            /* *** (STRANGE) RFC *** */
+            //"tests/emails/rfc/000", // must return text/enriched, we return text/plain
+            //"tests/emails/rfc/001", // does not recognize the multipart/external-body, breaks the
+                                      // whole parsing
+            //"tests/emails/rfc/002", // wrong date in email
+
+            //"tests/emails/rfc/003", // dovecot fixes \r\r: the bytes number is wrong + text/enriched
+
+            /* *** THIRD PARTY *** */
+            //"tests/emails/thirdparty/000", // dovecot fixes \r\r: the bytes number is wrong
+            //"tests/emails/thirdparty/001", // same
+            "tests/emails/thirdparty/002", // same
+
+                                           /* *** LEGACY *** */
+                                           //"tests/emails/legacy/000", // same issue with \r\r
+        ];
+
+        for pref in prefixes.iter() {
+            println!("{}", pref);
+            let txt = fs::read(format!("{}.eml", pref))?;
+            let oracle = fs::read(format!("{}.dovecot.body", pref))?;
+            let message = eml_codec::parse_message(&txt).unwrap().1;
+
+            let test_repr = Response::Data(Data::Fetch {
+                seq: NonZeroU32::new(1).unwrap(),
+                items: Vec1::from(MessageDataItem::Body(mime_view::bodystructure(
+                    &message.child,
+                    false,
+                )?)),
+            });
+            let test_bytes = ResponseCodec::new().encode(&test_repr).dump();
+            let test_str = String::from_utf8_lossy(&test_bytes).to_lowercase();
+
+            let oracle_str =
+                format!("* 1 FETCH {}\r\n", String::from_utf8_lossy(&oracle)).to_lowercase();
+
+            println!("aerogramme: {}\n\ndovecot:    {}\n\n", test_str, oracle_str);
+            //println!("\n\n {} \n\n", String::from_utf8_lossy(&resp));
+            assert_eq!(test_str, oracle_str);
+        }
+
+        Ok(())
+    }
+}
diff --git a/aero-proto/src/imap/mime_view.rs b/aero-proto/src/imap/mime_view.rs
new file mode 100644
index 0000000..720f20a
--- /dev/null
+++ b/aero-proto/src/imap/mime_view.rs
@@ -0,0 +1,582 @@
+use std::borrow::Cow;
+use std::collections::HashSet;
+use std::num::NonZeroU32;
+
+use anyhow::{anyhow, bail, Result};
+
+use imap_codec::imap_types::body::{
+    BasicFields, Body as FetchBody, BodyStructure, MultiPartExtensionData, SinglePartExtensionData,
+    SpecificFields,
+};
+use imap_codec::imap_types::core::{AString, IString, NString, Vec1};
+use imap_codec::imap_types::fetch::{Part as FetchPart, Section as FetchSection};
+
+use eml_codec::{
+    header, mime, mime::r#type::Deductible, part::composite, part::discrete, part::AnyPart,
+};
+
+use crate::imap::imf_view::ImfView;
+
+pub enum BodySection<'a> {
+    Full(Cow<'a, [u8]>),
+    Slice {
+        body: Cow<'a, [u8]>,
+        origin_octet: u32,
+    },
+}
+
+/// Logic for BODY[<section>]<<partial>>
+/// Works in 3 times:
+///  1. Find the section (RootMime::subset)
+///  2. Apply the extraction logic (SelectedMime::extract), like TEXT, HEADERS, etc.
+///  3. Keep only the given subset provided by partial
+///
+/// Example of message sections:
+///
+/// ```
+///    HEADER     ([RFC-2822] header of the message)
+///    TEXT       ([RFC-2822] text body of the message) MULTIPART/MIXED
+///    1          TEXT/PLAIN
+///    2          APPLICATION/OCTET-STREAM
+///    3          MESSAGE/RFC822
+///    3.HEADER   ([RFC-2822] header of the message)
+///    3.TEXT     ([RFC-2822] text body of the message) MULTIPART/MIXED
+///    3.1        TEXT/PLAIN
+///    3.2        APPLICATION/OCTET-STREAM
+///    4          MULTIPART/MIXED
+///    4.1        IMAGE/GIF
+///    4.1.MIME   ([MIME-IMB] header for the IMAGE/GIF)
+///    4.2        MESSAGE/RFC822
+///    4.2.HEADER ([RFC-2822] header of the message)
+///    4.2.TEXT   ([RFC-2822] text body of the message) MULTIPART/MIXED
+///    4.2.1      TEXT/PLAIN
+///    4.2.2      MULTIPART/ALTERNATIVE
+///    4.2.2.1    TEXT/PLAIN
+///    4.2.2.2    TEXT/RICHTEXT
+/// ```
+pub fn body_ext<'a>(
+    part: &'a AnyPart<'a>,
+    section: &'a Option<FetchSection<'a>>,
+    partial: &'a Option<(u32, NonZeroU32)>,
+) -> Result<BodySection<'a>> {
+    let root_mime = NodeMime(part);
+    let (extractor, path) = SubsettedSection::from(section);
+    let selected_mime = root_mime.subset(path)?;
+    let extracted_full = selected_mime.extract(&extractor)?;
+    Ok(extracted_full.to_body_section(partial))
+}
+
+/// Logic for BODY and BODYSTRUCTURE
+///
+/// ```raw
+/// b fetch 29878:29879 (BODY)
+/// * 29878 FETCH (BODY (("text" "plain" ("charset" "utf-8") NIL NIL "quoted-printable" 3264 82)("text" "html" ("charset" "utf-8") NIL NIL "quoted-printable" 31834 643) "alternative"))
+/// * 29879 FETCH (BODY ("text" "html" ("charset" "us-ascii") NIL NIL "7bit" 4107 131))
+///                                   ^^^^^^^^^^^^^^^^^^^^^^ ^^^ ^^^ ^^^^^^ ^^^^ ^^^
+///                                   |                      |   |   |      |    | number of lines
+///                                   |                      |   |   |      | size
+///                                   |                      |   |   | content transfer encoding
+///                                   |                      |   | description
+///                                   |                      | id
+///                                   | parameter list
+/// b OK Fetch completed (0.001 + 0.000 secs).
+/// ```
+pub fn bodystructure(part: &AnyPart, is_ext: bool) -> Result<BodyStructure<'static>> {
+    NodeMime(part).structure(is_ext)
+}
+
+/// NodeMime
+///
+/// Used for recursive logic on MIME.
+/// See SelectedMime for inspection.
+struct NodeMime<'a>(&'a AnyPart<'a>);
+impl<'a> NodeMime<'a> {
+    /// A MIME object is a tree of elements.
+    /// The path indicates which element must be picked.
+    /// This function returns the picked element as the new view
+    fn subset(self, path: Option<&'a FetchPart>) -> Result<SelectedMime<'a>> {
+        match path {
+            None => Ok(SelectedMime(self.0)),
+            Some(v) => self.rec_subset(v.0.as_ref()),
+        }
+    }
+
+    fn rec_subset(self, path: &'a [NonZeroU32]) -> Result<SelectedMime> {
+        if path.is_empty() {
+            Ok(SelectedMime(self.0))
+        } else {
+            match self.0 {
+                AnyPart::Mult(x) => {
+                    let next = Self(x.children
+                        .get(path[0].get() as usize - 1)
+                        .ok_or(anyhow!("Unable to resolve subpath {:?}, current multipart has only {} elements", path, x.children.len()))?);
+                    next.rec_subset(&path[1..])
+                },
+                AnyPart::Msg(x) => {
+                    let next = Self(x.child.as_ref());
+                    next.rec_subset(path)
+                },
+                _ => bail!("You tried to access a subpart on an atomic part (text or binary). Unresolved subpath {:?}", path),
+            }
+        }
+    }
+
+    fn structure(&self, is_ext: bool) -> Result<BodyStructure<'static>> {
+        match self.0 {
+            AnyPart::Txt(x) => NodeTxt(self, x).structure(is_ext),
+            AnyPart::Bin(x) => NodeBin(self, x).structure(is_ext),
+            AnyPart::Mult(x) => NodeMult(self, x).structure(is_ext),
+            AnyPart::Msg(x) => NodeMsg(self, x).structure(is_ext),
+        }
+    }
+}
+
+//----------------------------------------------------------
+
+/// A FetchSection must be handled in 2 times:
+///  - First we must extract the MIME part
+///  - Then we must process it as desired
+/// The given struct mixes both work, so
+/// we separate this work here.
+enum SubsettedSection<'a> {
+    Part,
+    Header,
+    HeaderFields(&'a Vec1<AString<'a>>),
+    HeaderFieldsNot(&'a Vec1<AString<'a>>),
+    Text,
+    Mime,
+}
+impl<'a> SubsettedSection<'a> {
+    fn from(section: &'a Option<FetchSection>) -> (Self, Option<&'a FetchPart>) {
+        match section {
+            Some(FetchSection::Text(maybe_part)) => (Self::Text, maybe_part.as_ref()),
+            Some(FetchSection::Header(maybe_part)) => (Self::Header, maybe_part.as_ref()),
+            Some(FetchSection::HeaderFields(maybe_part, fields)) => {
+                (Self::HeaderFields(fields), maybe_part.as_ref())
+            }
+            Some(FetchSection::HeaderFieldsNot(maybe_part, fields)) => {
+                (Self::HeaderFieldsNot(fields), maybe_part.as_ref())
+            }
+            Some(FetchSection::Mime(part)) => (Self::Mime, Some(part)),
+            Some(FetchSection::Part(part)) => (Self::Part, Some(part)),
+            None => (Self::Part, None),
+        }
+    }
+}
+
+/// Used for current MIME inspection
+///
+/// See NodeMime for recursive logic
+pub struct SelectedMime<'a>(pub &'a AnyPart<'a>);
+impl<'a> SelectedMime<'a> {
+    pub fn header_value(&'a self, to_match_ext: &[u8]) -> Option<&'a [u8]> {
+        let to_match = to_match_ext.to_ascii_lowercase();
+
+        self.eml_mime()
+            .kv
+            .iter()
+            .filter_map(|field| match field {
+                header::Field::Good(header::Kv2(k, v)) => Some((k, v)),
+                _ => None,
+            })
+            .find(|(k, _)| k.to_ascii_lowercase() == to_match)
+            .map(|(_, v)| v)
+            .copied()
+    }
+
+    /// The subsetted fetch section basically tells us the
+    /// extraction logic to apply on our selected MIME.
+    /// This function acts as a router for these logic.
+    fn extract(&self, extractor: &SubsettedSection<'a>) -> Result<ExtractedFull<'a>> {
+        match extractor {
+            SubsettedSection::Text => self.text(),
+            SubsettedSection::Header => self.header(),
+            SubsettedSection::HeaderFields(fields) => self.header_fields(fields, false),
+            SubsettedSection::HeaderFieldsNot(fields) => self.header_fields(fields, true),
+            SubsettedSection::Part => self.part(),
+            SubsettedSection::Mime => self.mime(),
+        }
+    }
+
+    fn mime(&self) -> Result<ExtractedFull<'a>> {
+        let bytes = match &self.0 {
+            AnyPart::Txt(p) => p.mime.fields.raw,
+            AnyPart::Bin(p) => p.mime.fields.raw,
+            AnyPart::Msg(p) => p.child.mime().raw,
+            AnyPart::Mult(p) => p.mime.fields.raw,
+        };
+        Ok(ExtractedFull(bytes.into()))
+    }
+
+    fn part(&self) -> Result<ExtractedFull<'a>> {
+        let bytes = match &self.0 {
+            AnyPart::Txt(p) => p.body,
+            AnyPart::Bin(p) => p.body,
+            AnyPart::Msg(p) => p.raw_part,
+            AnyPart::Mult(_) => bail!("Multipart part has no body"),
+        };
+        Ok(ExtractedFull(bytes.to_vec().into()))
+    }
+
+    fn eml_mime(&self) -> &eml_codec::mime::NaiveMIME<'_> {
+        match &self.0 {
+            AnyPart::Msg(msg) => msg.child.mime(),
+            other => other.mime(),
+        }
+    }
+
+    /// The [...] HEADER.FIELDS, and HEADER.FIELDS.NOT part
+    /// specifiers refer to the [RFC-2822] header of the message or of
+    /// an encapsulated [MIME-IMT] MESSAGE/RFC822 message.
+    /// HEADER.FIELDS and HEADER.FIELDS.NOT are followed by a list of
+    /// field-name (as defined in [RFC-2822]) names, and return a
+    /// subset of the header.  The subset returned by HEADER.FIELDS
+    /// contains only those header fields with a field-name that
+    /// matches one of the names in the list; similarly, the subset
+    /// returned by HEADER.FIELDS.NOT contains only the header fields
+    /// with a non-matching field-name.  The field-matching is
+    /// case-insensitive but otherwise exact.
+    fn header_fields(
+        &self,
+        fields: &'a Vec1<AString<'a>>,
+        invert: bool,
+    ) -> Result<ExtractedFull<'a>> {
+        // Build a lowercase ascii hashset with the fields to fetch
+        let index = fields
+            .as_ref()
+            .iter()
+            .map(|x| {
+                match x {
+                    AString::Atom(a) => a.inner().as_bytes(),
+                    AString::String(IString::Literal(l)) => l.as_ref(),
+                    AString::String(IString::Quoted(q)) => q.inner().as_bytes(),
+                }
+                .to_ascii_lowercase()
+            })
+            .collect::<HashSet<_>>();
+
+        // Extract MIME headers
+        let mime = self.eml_mime();
+
+        // Filter our MIME headers based on the field index
+        // 1. Keep only the correctly formatted headers
+        // 2. Keep only based on the index presence or absence
+        // 3. Reduce as a byte vector
+        let buffer = mime
+            .kv
+            .iter()
+            .filter_map(|field| match field {
+                header::Field::Good(header::Kv2(k, v)) => Some((k, v)),
+                _ => None,
+            })
+            .filter(|(k, _)| index.contains(&k.to_ascii_lowercase()) ^ invert)
+            .fold(vec![], |mut acc, (k, v)| {
+                acc.extend(*k);
+                acc.extend(b": ");
+                acc.extend(*v);
+                acc.extend(b"\r\n");
+                acc
+            });
+
+        Ok(ExtractedFull(buffer.into()))
+    }
+
+    /// The HEADER [...] part specifiers refer to the [RFC-2822] header of the message or of
+    /// an encapsulated [MIME-IMT] MESSAGE/RFC822 message.
+    /// ```raw
+    /// HEADER     ([RFC-2822] header of the message)
+    /// ```
+    fn header(&self) -> Result<ExtractedFull<'a>> {
+        let msg = self
+            .0
+            .as_message()
+            .ok_or(anyhow!("Selected part must be a message/rfc822"))?;
+        Ok(ExtractedFull(msg.raw_headers.into()))
+    }
+
+    /// The TEXT part specifier refers to the text body of the message, omitting the [RFC-2822] header.
+    fn text(&self) -> Result<ExtractedFull<'a>> {
+        let msg = self
+            .0
+            .as_message()
+            .ok_or(anyhow!("Selected part must be a message/rfc822"))?;
+        Ok(ExtractedFull(msg.raw_body.into()))
+    }
+
+    // ------------
+
+    /// Basic field of a MIME part that is
+    /// common to all parts
+    fn basic_fields(&self) -> Result<BasicFields<'static>> {
+        let sz = match self.0 {
+            AnyPart::Txt(x) => x.body.len(),
+            AnyPart::Bin(x) => x.body.len(),
+            AnyPart::Msg(x) => x.raw_part.len(),
+            AnyPart::Mult(_) => 0,
+        };
+        let m = self.0.mime();
+        let parameter_list = m
+            .ctype
+            .as_ref()
+            .map(|x| {
+                x.params
+                    .iter()
+                    .map(|p| {
+                        (
+                            IString::try_from(String::from_utf8_lossy(p.name).to_string()),
+                            IString::try_from(p.value.to_string()),
+                        )
+                    })
+                    .filter(|(k, v)| k.is_ok() && v.is_ok())
+                    .map(|(k, v)| (k.unwrap(), v.unwrap()))
+                    .collect()
+            })
+            .unwrap_or(vec![]);
+
+        Ok(BasicFields {
+            parameter_list,
+            id: NString(
+                m.id.as_ref()
+                    .and_then(|ci| IString::try_from(ci.to_string()).ok()),
+            ),
+            description: NString(
+                m.description
+                    .as_ref()
+                    .and_then(|cd| IString::try_from(cd.to_string()).ok()),
+            ),
+            content_transfer_encoding: match m.transfer_encoding {
+                mime::mechanism::Mechanism::_8Bit => unchecked_istring("8bit"),
+                mime::mechanism::Mechanism::Binary => unchecked_istring("binary"),
+                mime::mechanism::Mechanism::QuotedPrintable => {
+                    unchecked_istring("quoted-printable")
+                }
+                mime::mechanism::Mechanism::Base64 => unchecked_istring("base64"),
+                _ => unchecked_istring("7bit"),
+            },
+            // @FIXME we can't compute the size of the message currently...
+            size: u32::try_from(sz)?,
+        })
+    }
+}
+
+// ---------------------------
+struct NodeMsg<'a>(&'a NodeMime<'a>, &'a composite::Message<'a>);
+impl<'a> NodeMsg<'a> {
+    fn structure(&self, is_ext: bool) -> Result<BodyStructure<'static>> {
+        let basic = SelectedMime(self.0 .0).basic_fields()?;
+
+        Ok(BodyStructure::Single {
+            body: FetchBody {
+                basic,
+                specific: SpecificFields::Message {
+                    envelope: Box::new(ImfView(&self.1.imf).message_envelope()),
+                    body_structure: Box::new(NodeMime(&self.1.child).structure(is_ext)?),
+                    number_of_lines: nol(self.1.raw_part),
+                },
+            },
+            extension_data: match is_ext {
+                true => Some(SinglePartExtensionData {
+                    md5: NString(None),
+                    tail: None,
+                }),
+                _ => None,
+            },
+        })
+    }
+}
+
+#[allow(dead_code)]
+struct NodeMult<'a>(&'a NodeMime<'a>, &'a composite::Multipart<'a>);
+impl<'a> NodeMult<'a> {
+    fn structure(&self, is_ext: bool) -> Result<BodyStructure<'static>> {
+        let itype = &self.1.mime.interpreted_type;
+        let subtype = IString::try_from(itype.subtype.to_string())
+            .unwrap_or(unchecked_istring("alternative"));
+
+        let inner_bodies = self
+            .1
+            .children
+            .iter()
+            .filter_map(|inner| NodeMime(&inner).structure(is_ext).ok())
+            .collect::<Vec<_>>();
+
+        Vec1::validate(&inner_bodies)?;
+        let bodies = Vec1::unvalidated(inner_bodies);
+
+        Ok(BodyStructure::Multi {
+            bodies,
+            subtype,
+            extension_data: match is_ext {
+                true => Some(MultiPartExtensionData {
+                    parameter_list: vec![(
+                        IString::try_from("boundary").unwrap(),
+                        IString::try_from(self.1.mime.interpreted_type.boundary.to_string())?,
+                    )],
+                    tail: None,
+                }),
+                _ => None,
+            },
+        })
+    }
+}
+struct NodeTxt<'a>(&'a NodeMime<'a>, &'a discrete::Text<'a>);
+impl<'a> NodeTxt<'a> {
+    fn structure(&self, is_ext: bool) -> Result<BodyStructure<'static>> {
+        let mut basic = SelectedMime(self.0 .0).basic_fields()?;
+
+        // Get the interpreted content type, set it
+        let itype = match &self.1.mime.interpreted_type {
+            Deductible::Inferred(v) | Deductible::Explicit(v) => v,
+        };
+        let subtype =
+            IString::try_from(itype.subtype.to_string()).unwrap_or(unchecked_istring("plain"));
+
+        // Add charset to the list of parameters if we know it has been inferred as it will be
+        // missing from the parsed content.
+        if let Deductible::Inferred(charset) = &itype.charset {
+            basic.parameter_list.push((
+                unchecked_istring("charset"),
+                IString::try_from(charset.to_string()).unwrap_or(unchecked_istring("us-ascii")),
+            ));
+        }
+
+        Ok(BodyStructure::Single {
+            body: FetchBody {
+                basic,
+                specific: SpecificFields::Text {
+                    subtype,
+                    number_of_lines: nol(self.1.body),
+                },
+            },
+            extension_data: match is_ext {
+                true => Some(SinglePartExtensionData {
+                    md5: NString(None),
+                    tail: None,
+                }),
+                _ => None,
+            },
+        })
+    }
+}
+
+struct NodeBin<'a>(&'a NodeMime<'a>, &'a discrete::Binary<'a>);
+impl<'a> NodeBin<'a> {
+    fn structure(&self, is_ext: bool) -> Result<BodyStructure<'static>> {
+        let basic = SelectedMime(self.0 .0).basic_fields()?;
+
+        let default = mime::r#type::NaiveType {
+            main: &b"application"[..],
+            sub: &b"octet-stream"[..],
+            params: vec![],
+        };
+        let ct = self.1.mime.fields.ctype.as_ref().unwrap_or(&default);
+
+        let r#type = IString::try_from(String::from_utf8_lossy(ct.main).to_string()).or(Err(
+            anyhow!("Unable to build IString from given Content-Type type given"),
+        ))?;
+
+        let subtype = IString::try_from(String::from_utf8_lossy(ct.sub).to_string()).or(Err(
+            anyhow!("Unable to build IString from given Content-Type subtype given"),
+        ))?;
+
+        Ok(BodyStructure::Single {
+            body: FetchBody {
+                basic,
+                specific: SpecificFields::Basic { r#type, subtype },
+            },
+            extension_data: match is_ext {
+                true => Some(SinglePartExtensionData {
+                    md5: NString(None),
+                    tail: None,
+                }),
+                _ => None,
+            },
+        })
+    }
+}
+
+// ---------------------------
+
+struct ExtractedFull<'a>(Cow<'a, [u8]>);
+impl<'a> ExtractedFull<'a> {
+    /// It is possible to fetch a substring of the designated text.
+    /// This is done by appending an open angle bracket ("<"), the
+    /// octet position of the first desired octet, a period, the
+    /// maximum number of octets desired, and a close angle bracket
+    /// (">") to the part specifier.  If the starting octet is beyond
+    /// the end of the text, an empty string is returned.
+    ///
+    /// Any partial fetch that attempts to read beyond the end of the
+    /// text is truncated as appropriate.  A partial fetch that starts
+    /// at octet 0 is returned as a partial fetch, even if this
+    /// truncation happened.
+    ///
+    /// Note: This means that BODY[]<0.2048> of a 1500-octet message
+    /// will return BODY[]<0> with a literal of size 1500, not
+    /// BODY[].
+    ///
+    /// Note: A substring fetch of a HEADER.FIELDS or
+    /// HEADER.FIELDS.NOT part specifier is calculated after
+    /// subsetting the header.
+    fn to_body_section(self, partial: &'_ Option<(u32, NonZeroU32)>) -> BodySection<'a> {
+        match partial {
+            Some((begin, len)) => self.partialize(*begin, *len),
+            None => BodySection::Full(self.0),
+        }
+    }
+
+    fn partialize(self, begin: u32, len: NonZeroU32) -> BodySection<'a> {
+        // Asked range is starting after the end of the content,
+        // returning an empty buffer
+        if begin as usize > self.0.len() {
+            return BodySection::Slice {
+                body: Cow::Borrowed(&[][..]),
+                origin_octet: begin,
+            };
+        }
+
+        // Asked range is ending after the end of the content,
+        // slice only the beginning of the buffer
+        if (begin + len.get()) as usize >= self.0.len() {
+            return BodySection::Slice {
+                body: match self.0 {
+                    Cow::Borrowed(body) => Cow::Borrowed(&body[begin as usize..]),
+                    Cow::Owned(body) => Cow::Owned(body[begin as usize..].to_vec()),
+                },
+                origin_octet: begin,
+            };
+        }
+
+        // Range is included inside the considered content,
+        // this is the "happy case"
+        BodySection::Slice {
+            body: match self.0 {
+                Cow::Borrowed(body) => {
+                    Cow::Borrowed(&body[begin as usize..(begin + len.get()) as usize])
+                }
+                Cow::Owned(body) => {
+                    Cow::Owned(body[begin as usize..(begin + len.get()) as usize].to_vec())
+                }
+            },
+            origin_octet: begin,
+        }
+    }
+}
+
+/// ---- LEGACY
+
+/// s is set to static to ensure that only compile time values
+/// checked by developpers are passed.
+fn unchecked_istring(s: &'static str) -> IString {
+    IString::try_from(s).expect("this value is expected to be a valid imap-codec::IString")
+}
+
+// Number Of Lines
+fn nol(input: &[u8]) -> u32 {
+    input
+        .iter()
+        .filter(|x| **x == b'\n')
+        .count()
+        .try_into()
+        .unwrap_or(0)
+}
diff --git a/aero-proto/src/imap/mod.rs b/aero-proto/src/imap/mod.rs
new file mode 100644
index 0000000..ae3b58f
--- /dev/null
+++ b/aero-proto/src/imap/mod.rs
@@ -0,0 +1,417 @@
+mod attributes;
+mod capability;
+mod command;
+mod flags;
+mod flow;
+mod imf_view;
+mod index;
+mod mail_view;
+mod mailbox_view;
+mod mime_view;
+mod request;
+mod response;
+mod search;
+mod session;
+
+use std::net::SocketAddr;
+
+use anyhow::{anyhow, bail, Result};
+use futures::stream::{FuturesUnordered, StreamExt};
+use tokio::net::TcpListener;
+use tokio::sync::mpsc;
+use tokio::sync::watch;
+use imap_codec::imap_types::response::{Code, CommandContinuationRequest, Response, Status};
+use imap_codec::imap_types::{core::Text, response::Greeting};
+use imap_flow::server::{ServerFlow, ServerFlowEvent, ServerFlowOptions};
+use imap_flow::stream::AnyStream;
+use rustls_pemfile::{certs, private_key};
+use tokio_rustls::TlsAcceptor;
+
+use aero_user::config::{ImapConfig, ImapUnsecureConfig};
+use aero_user::login::ArcLoginProvider;
+
+use crate::imap::capability::ServerCapability;
+use crate::imap::request::Request;
+use crate::imap::response::{Body, ResponseOrIdle};
+use crate::imap::session::Instance;
+
+/// Server is a thin wrapper to register our Services in BàL
+pub struct Server {
+    bind_addr: SocketAddr,
+    login_provider: ArcLoginProvider,
+    capabilities: ServerCapability,
+    tls: Option<TlsAcceptor>,
+}
+
+#[derive(Clone)]
+struct ClientContext {
+    addr: SocketAddr,
+    login_provider: ArcLoginProvider,
+    must_exit: watch::Receiver<bool>,
+    server_capabilities: ServerCapability,
+}
+
+pub fn new(config: ImapConfig, login: ArcLoginProvider) -> Result<Server> {
+    let loaded_certs = certs(&mut std::io::BufReader::new(std::fs::File::open(
+        config.certs,
+    )?))
+    .collect::<Result<Vec<_>, _>>()?;
+    let loaded_key = private_key(&mut std::io::BufReader::new(std::fs::File::open(
+        config.key,
+    )?))?
+    .unwrap();
+
+    let tls_config = rustls::ServerConfig::builder()
+        .with_no_client_auth()
+        .with_single_cert(loaded_certs, loaded_key)?;
+    let acceptor = TlsAcceptor::from(Arc::new(tls_config));
+
+    Ok(Server {
+        bind_addr: config.bind_addr,
+        login_provider: login,
+        capabilities: ServerCapability::default(),
+        tls: Some(acceptor),
+    })
+}
+
+pub fn new_unsecure(config: ImapUnsecureConfig, login: ArcLoginProvider) -> Server {
+    Server {
+        bind_addr: config.bind_addr,
+        login_provider: login,
+        capabilities: ServerCapability::default(),
+        tls: None,
+    }
+}
+
+impl Server {
+    pub async fn run(self: Self, mut must_exit: watch::Receiver<bool>) -> Result<()> {
+        let tcp = TcpListener::bind(self.bind_addr).await?;
+        tracing::info!("IMAP server listening on {:#}", self.bind_addr);
+
+        let mut connections = FuturesUnordered::new();
+
+        while !*must_exit.borrow() {
+            let wait_conn_finished = async {
+                if connections.is_empty() {
+                    futures::future::pending().await
+                } else {
+                    connections.next().await
+                }
+            };
+            let (socket, remote_addr) = tokio::select! {
+                a = tcp.accept() => a?,
+                _ = wait_conn_finished => continue,
+                _ = must_exit.changed() => continue,
+            };
+            tracing::info!("IMAP: accepted connection from {}", remote_addr);
+            let stream = match self.tls.clone() {
+                Some(acceptor) => {
+                    let stream = match acceptor.accept(socket).await {
+                        Ok(v) => v,
+                        Err(e) => {
+                            tracing::error!(err=?e, "TLS negociation failed");
+                            continue;
+                        }
+                    };
+                    AnyStream::new(stream)
+                }
+                None => AnyStream::new(socket),
+            };
+
+            let client = ClientContext {
+                addr: remote_addr.clone(),
+                login_provider: self.login_provider.clone(),
+                must_exit: must_exit.clone(),
+                server_capabilities: self.capabilities.clone(),
+            };
+            let conn = tokio::spawn(NetLoop::handler(client, stream));
+            connections.push(conn);
+        }
+        drop(tcp);
+
+        tracing::info!("IMAP server shutting down, draining remaining connections...");
+        while connections.next().await.is_some() {}
+
+        Ok(())
+    }
+}
+
+use std::sync::Arc;
+use tokio::sync::mpsc::*;
+use tokio::sync::Notify;
+
+const PIPELINABLE_COMMANDS: usize = 64;
+
+// @FIXME a full refactor of this part of the code will be needed sooner or later
+struct NetLoop {
+    ctx: ClientContext,
+    server: ServerFlow,
+    cmd_tx: Sender<Request>,
+    resp_rx: UnboundedReceiver<ResponseOrIdle>,
+}
+
+impl NetLoop {
+    async fn handler(ctx: ClientContext, sock: AnyStream) {
+        let addr = ctx.addr.clone();
+
+        let mut nl = match Self::new(ctx, sock).await {
+            Ok(nl) => {
+                tracing::debug!(addr=?addr, "netloop successfully initialized");
+                nl
+            }
+            Err(e) => {
+                tracing::error!(addr=?addr, err=?e, "netloop can not be initialized, closing session");
+                return;
+            }
+        };
+
+        match nl.core().await {
+            Ok(()) => {
+                tracing::debug!("closing successful netloop core for {:?}", addr);
+            }
+            Err(e) => {
+                tracing::error!("closing errored netloop core for {:?}: {}", addr, e);
+            }
+        }
+    }
+
+    async fn new(ctx: ClientContext, sock: AnyStream) -> Result<Self> {
+        let mut opts = ServerFlowOptions::default();
+        opts.crlf_relaxed = false;
+        opts.literal_accept_text = Text::unvalidated("OK");
+        opts.literal_reject_text = Text::unvalidated("Literal rejected");
+
+        // Send greeting
+        let (server, _) = ServerFlow::send_greeting(
+            sock,
+            opts,
+            Greeting::ok(
+                Some(Code::Capability(ctx.server_capabilities.to_vec())),
+                "Aerogramme",
+            )
+            .unwrap(),
+        )
+        .await?;
+
+        // Start a mailbox session in background
+        let (cmd_tx, cmd_rx) = mpsc::channel::<Request>(PIPELINABLE_COMMANDS);
+        let (resp_tx, resp_rx) = mpsc::unbounded_channel::<ResponseOrIdle>();
+        tokio::spawn(Self::session(ctx.clone(), cmd_rx, resp_tx));
+
+        // Return the object
+        Ok(NetLoop {
+            ctx,
+            server,
+            cmd_tx,
+            resp_rx,
+        })
+    }
+
+    /// Coms with the background session
+    async fn session(
+        ctx: ClientContext,
+        mut cmd_rx: Receiver<Request>,
+        resp_tx: UnboundedSender<ResponseOrIdle>,
+    ) -> () {
+        let mut session = Instance::new(ctx.login_provider, ctx.server_capabilities);
+        loop {
+            let cmd = match cmd_rx.recv().await {
+                None => break,
+                Some(cmd_recv) => cmd_recv,
+            };
+
+            tracing::debug!(cmd=?cmd, sock=%ctx.addr, "command");
+            let maybe_response = session.request(cmd).await;
+            tracing::debug!(cmd=?maybe_response, sock=%ctx.addr, "response");
+
+            match resp_tx.send(maybe_response) {
+                Err(_) => break,
+                Ok(_) => (),
+            };
+        }
+        tracing::info!("runner is quitting");
+    }
+
+    async fn core(&mut self) -> Result<()> {
+        let mut maybe_idle: Option<Arc<Notify>> = None;
+        loop {
+            tokio::select! {
+                // Managing imap_flow stuff
+                srv_evt = self.server.progress() =>  match srv_evt? {
+                    ServerFlowEvent::ResponseSent { handle: _handle, response } => {
+                        match response {
+                            Response::Status(Status::Bye(_)) => return Ok(()),
+                            _ => tracing::trace!("sent to {} content {:?}", self.ctx.addr, response),
+                        }
+                    },
+                    ServerFlowEvent::CommandReceived { command } => {
+                        match self.cmd_tx.try_send(Request::ImapCommand(command)) {
+                            Ok(_) => (),
+                            Err(mpsc::error::TrySendError::Full(_)) => {
+                                self.server.enqueue_status(Status::bye(None, "Too fast").unwrap());
+                                tracing::error!("client {:?} is sending commands too fast, closing.", self.ctx.addr);
+                            }
+                            _ => {
+                                self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
+                                tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
+                            }
+                        }
+                    },
+                    ServerFlowEvent::IdleCommandReceived { tag } => {
+                        match self.cmd_tx.try_send(Request::IdleStart(tag)) {
+                            Ok(_) => (),
+                            Err(mpsc::error::TrySendError::Full(_)) => {
+                                self.server.enqueue_status(Status::bye(None, "Too fast").unwrap());
+                                tracing::error!("client {:?} is sending commands too fast, closing.", self.ctx.addr);
+                            }
+                            _ => {
+                                self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
+                                tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
+                            }
+                        }
+                    }
+                    ServerFlowEvent::IdleDoneReceived => {
+                        tracing::trace!("client sent DONE and want to stop IDLE");
+                        maybe_idle.ok_or(anyhow!("Received IDLE done but not idling currently"))?.notify_one();
+                        maybe_idle = None;
+                    }
+                    flow => {
+                        self.server.enqueue_status(Status::bye(None, "Unsupported server flow event").unwrap());
+                        tracing::error!("session task exited for {:?} due to unsupported flow {:?}", self.ctx.addr, flow);
+                    }
+                },
+
+                // Managing response generated by Aerogramme
+                maybe_msg = self.resp_rx.recv() => match maybe_msg {
+                    Some(ResponseOrIdle::Response(response)) => {
+                        tracing::trace!("Interactive, server has a response for the client");
+                        for body_elem in response.body.into_iter() {
+                            let _handle = match body_elem {
+                                Body::Data(d) => self.server.enqueue_data(d),
+                                Body::Status(s) => self.server.enqueue_status(s),
+                            };
+                        }
+                        self.server.enqueue_status(response.completion);
+                    },
+                    Some(ResponseOrIdle::IdleAccept(stop)) => {
+                        tracing::trace!("Interactive, server agreed to switch in idle mode");
+                        let cr = CommandContinuationRequest::basic(None, "Idling")?;
+                        self.server.idle_accept(cr).or(Err(anyhow!("refused continuation for idle accept")))?;
+                        self.cmd_tx.try_send(Request::IdlePoll)?;
+                        if maybe_idle.is_some() {
+                            bail!("Can't start IDLE if already idling");
+                        }
+                        maybe_idle = Some(stop);
+                    },
+                    Some(ResponseOrIdle::IdleEvent(elems)) => {
+                        tracing::trace!("server imap session has some change to communicate to the client");
+                        for body_elem in elems.into_iter() {
+                            let _handle = match body_elem {
+                                Body::Data(d) => self.server.enqueue_data(d),
+                                Body::Status(s) => self.server.enqueue_status(s),
+                            };
+                        }
+                        self.cmd_tx.try_send(Request::IdlePoll)?;
+                    },
+                    Some(ResponseOrIdle::IdleReject(response)) => {
+                        tracing::trace!("inform client that session rejected idle");
+                        self.server
+                            .idle_reject(response.completion)
+                            .or(Err(anyhow!("wrong reject command")))?;
+                    },
+                    None => {
+                        self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
+                        tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
+                    },
+                },
+
+                // When receiving a CTRL+C
+                _ = self.ctx.must_exit.changed() => {
+                    tracing::trace!("Interactive, CTRL+C, exiting");
+                    self.server.enqueue_status(Status::bye(None, "Server is being shutdown").unwrap());
+                },
+            };
+        }
+    }
+
+    /*
+    async fn idle_mode(&mut self, mut buff: BytesMut, stop: Arc<Notify>) -> Result<LoopMode> {
+        // Flush send
+        loop {
+            tracing::trace!("flush server send");
+            match self.server.progress_send().await? {
+                Some(..) => continue,
+                None => break,
+            }
+        }
+
+        tokio::select! {
+            // Receiving IDLE event from background
+            maybe_msg = self.resp_rx.recv() => match maybe_msg {
+                // Session decided idle is terminated
+                Some(ResponseOrIdle::Response(response)) => {
+                    tracing::trace!("server imap session said idle is done, sending response done, switching to interactive");
+                    for body_elem in response.body.into_iter() {
+                        let _handle = match body_elem {
+                            Body::Data(d) => self.server.enqueue_data(d),
+                            Body::Status(s) => self.server.enqueue_status(s),
+                        };
+                    }
+                    self.server.enqueue_status(response.completion);
+                    return Ok(LoopMode::Interactive)
+                },
+                // Session has some information for user
+                Some(ResponseOrIdle::IdleEvent(elems)) => {
+                    tracing::trace!("server imap session has some change to communicate to the client");
+                    for body_elem in elems.into_iter() {
+                        let _handle = match body_elem {
+                            Body::Data(d) => self.server.enqueue_data(d),
+                            Body::Status(s) => self.server.enqueue_status(s),
+                        };
+                    }
+                    self.cmd_tx.try_send(Request::Idle)?;
+                    return Ok(LoopMode::Idle(buff, stop))
+                },
+
+                // Session crashed
+                None => {
+                    self.server.enqueue_status(Status::bye(None, "Internal session exited").unwrap());
+                    tracing::error!("session task exited for {:?}, quitting", self.ctx.addr);
+                    return Ok(LoopMode::Interactive)
+                },
+
+                // Session can't start idling while already idling, it's a logic error!
+                Some(ResponseOrIdle::StartIdle(..)) => bail!("can't start idling while already idling!"),
+            },
+
+            // User is trying to interact with us
+            read_client_result = self.server.stream.read(&mut buff) =>  {
+                let _bytes_read = read_client_result?;
+                use imap_codec::decode::Decoder;
+                let codec = imap_codec::IdleDoneCodec::new();
+                tracing::trace!("client sent some data for the server IMAP session");
+                match codec.decode(&buff) {
+                    Ok(([], imap_codec::imap_types::extensions::idle::IdleDone)) => {
+                        // Session will be informed that it must stop idle
+                        // It will generate the "done" message and change the loop mode
+                        tracing::trace!("client sent DONE and want to stop IDLE");
+                        stop.notify_one()
+                    },
+                    Err(_) => {
+                        tracing::trace!("Unable to decode DONE, maybe not enough data were sent?");
+                    },
+                    _ => bail!("Client sent data after terminating the continuation without waiting for the server. This is an unsupported behavior and bug in Aerogramme, quitting."),
+                };
+
+                return Ok(LoopMode::Idle(buff, stop))
+            },
+
+            // When receiving a CTRL+C
+            _ = self.ctx.must_exit.changed() => {
+                tracing::trace!("CTRL+C sent, aborting IDLE for this session");
+                self.server.enqueue_status(Status::bye(None, "Server is being shutdown").unwrap());
+                return Ok(LoopMode::Interactive)
+            },
+        };
+    }*/
+}
diff --git a/aero-proto/src/imap/request.rs b/aero-proto/src/imap/request.rs
new file mode 100644
index 0000000..cff18a3
--- /dev/null
+++ b/aero-proto/src/imap/request.rs
@@ -0,0 +1,9 @@
+use imap_codec::imap_types::command::Command;
+use imap_codec::imap_types::core::Tag;
+
+#[derive(Debug)]
+pub enum Request {
+    ImapCommand(Command<'static>),
+    IdleStart(Tag<'static>),
+    IdlePoll,
+}
diff --git a/aero-proto/src/imap/response.rs b/aero-proto/src/imap/response.rs
new file mode 100644
index 0000000..b6a0e98
--- /dev/null
+++ b/aero-proto/src/imap/response.rs
@@ -0,0 +1,124 @@
+use anyhow::Result;
+use imap_codec::imap_types::command::Command;
+use imap_codec::imap_types::core::Tag;
+use imap_codec::imap_types::response::{Code, Data, Status};
+use std::sync::Arc;
+use tokio::sync::Notify;
+
+#[derive(Debug)]
+pub enum Body<'a> {
+    Data(Data<'a>),
+    Status(Status<'a>),
+}
+
+pub struct ResponseBuilder<'a> {
+    tag: Option<Tag<'a>>,
+    code: Option<Code<'a>>,
+    text: String,
+    body: Vec<Body<'a>>,
+}
+
+impl<'a> ResponseBuilder<'a> {
+    pub fn to_req(mut self, cmd: &Command<'a>) -> Self {
+        self.tag = Some(cmd.tag.clone());
+        self
+    }
+    pub fn tag(mut self, tag: Tag<'a>) -> Self {
+        self.tag = Some(tag);
+        self
+    }
+
+    pub fn message(mut self, txt: impl Into<String>) -> Self {
+        self.text = txt.into();
+        self
+    }
+
+    pub fn code(mut self, code: Code<'a>) -> Self {
+        self.code = Some(code);
+        self
+    }
+
+    pub fn data(mut self, data: Data<'a>) -> Self {
+        self.body.push(Body::Data(data));
+        self
+    }
+
+    pub fn many_data(mut self, data: Vec<Data<'a>>) -> Self {
+        for d in data.into_iter() {
+            self = self.data(d);
+        }
+        self
+    }
+
+    #[allow(dead_code)]
+    pub fn info(mut self, status: Status<'a>) -> Self {
+        self.body.push(Body::Status(status));
+        self
+    }
+
+    #[allow(dead_code)]
+    pub fn many_info(mut self, status: Vec<Status<'a>>) -> Self {
+        for d in status.into_iter() {
+            self = self.info(d);
+        }
+        self
+    }
+
+    pub fn set_body(mut self, body: Vec<Body<'a>>) -> Self {
+        self.body = body;
+        self
+    }
+
+    pub fn ok(self) -> Result<Response<'a>> {
+        Ok(Response {
+            completion: Status::ok(self.tag, self.code, self.text)?,
+            body: self.body,
+        })
+    }
+
+    pub fn no(self) -> Result<Response<'a>> {
+        Ok(Response {
+            completion: Status::no(self.tag, self.code, self.text)?,
+            body: self.body,
+        })
+    }
+
+    pub fn bad(self) -> Result<Response<'a>> {
+        Ok(Response {
+            completion: Status::bad(self.tag, self.code, self.text)?,
+            body: self.body,
+        })
+    }
+}
+
+#[derive(Debug)]
+pub struct Response<'a> {
+    pub body: Vec<Body<'a>>,
+    pub completion: Status<'a>,
+}
+
+impl<'a> Response<'a> {
+    pub fn build() -> ResponseBuilder<'a> {
+        ResponseBuilder {
+            tag: None,
+            code: None,
+            text: "".to_string(),
+            body: vec![],
+        }
+    }
+
+    pub fn bye() -> Result<Response<'a>> {
+        Ok(Response {
+            completion: Status::bye(None, "bye")?,
+            body: vec![],
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum ResponseOrIdle {
+    Response(Response<'static>),
+    IdleAccept(Arc<Notify>),
+    IdleReject(Response<'static>),
+    IdleEvent(Vec<Body<'static>>),
+}
diff --git a/aero-proto/src/imap/search.rs b/aero-proto/src/imap/search.rs
new file mode 100644
index 0000000..3634a3a
--- /dev/null
+++ b/aero-proto/src/imap/search.rs
@@ -0,0 +1,478 @@
+use std::num::{NonZeroU32, NonZeroU64};
+
+use imap_codec::imap_types::core::Vec1;
+use imap_codec::imap_types::search::{MetadataItemSearch, SearchKey};
+use imap_codec::imap_types::sequence::{SeqOrUid, Sequence, SequenceSet};
+
+use aero_collections::mail::query::QueryScope;
+
+use crate::imap::index::MailIndex;
+use crate::imap::mail_view::MailView;
+
+pub enum SeqType {
+    Undefined,
+    NonUid,
+    Uid,
+}
+impl SeqType {
+    pub fn is_uid(&self) -> bool {
+        matches!(self, Self::Uid)
+    }
+}
+
+pub struct Criteria<'a>(pub &'a SearchKey<'a>);
+impl<'a> Criteria<'a> {
+    /// Returns a set of email identifiers that is greater or equal
+    /// to the set of emails to return
+    pub fn to_sequence_set(&self) -> (SequenceSet, SeqType) {
+        match self.0 {
+            SearchKey::All => (sequence_set_all(), SeqType::Undefined),
+            SearchKey::SequenceSet(seq_set) => (seq_set.clone(), SeqType::NonUid),
+            SearchKey::Uid(seq_set) => (seq_set.clone(), SeqType::Uid),
+            SearchKey::Not(_inner) => {
+                tracing::debug!(
+                    "using NOT in a search request is slow: it selects all identifiers"
+                );
+                (sequence_set_all(), SeqType::Undefined)
+            }
+            SearchKey::Or(left, right) => {
+                tracing::debug!("using OR in a search request is slow: no deduplication is done");
+                let (base, base_seqtype) = Self(&left).to_sequence_set();
+                let (ext, ext_seqtype) = Self(&right).to_sequence_set();
+
+                // Check if we have a UID/ID conflict in fetching: now we don't know how to handle them
+                match (base_seqtype, ext_seqtype) {
+                    (SeqType::Uid, SeqType::NonUid) | (SeqType::NonUid, SeqType::Uid) => {
+                        (sequence_set_all(), SeqType::Undefined)
+                    }
+                    (SeqType::Undefined, x) | (x, _) => {
+                        let mut new_vec = base.0.into_inner();
+                        new_vec.extend_from_slice(ext.0.as_ref());
+                        let seq = SequenceSet(
+                            Vec1::try_from(new_vec)
+                                .expect("merging non empty vec lead to non empty vec"),
+                        );
+                        (seq, x)
+                    }
+                }
+            }
+            SearchKey::And(search_list) => {
+                tracing::debug!(
+                    "using AND in a search request is slow: no intersection is performed"
+                );
+                // As we perform no intersection, we don't care if we mix uid or id.
+                // We only keep the smallest range, being it ID or UID, depending of
+                // which one has the less items. This is an approximation as UID ranges
+                // can have holes while ID ones can't.
+                search_list
+                    .as_ref()
+                    .iter()
+                    .map(|crit| Self(&crit).to_sequence_set())
+                    .min_by(|(x, _), (y, _)| {
+                        let x_size = approx_sequence_set_size(x);
+                        let y_size = approx_sequence_set_size(y);
+                        x_size.cmp(&y_size)
+                    })
+                    .unwrap_or((sequence_set_all(), SeqType::Undefined))
+            }
+            _ => (sequence_set_all(), SeqType::Undefined),
+        }
+    }
+
+    /// Not really clever as we can have cases where we filter out
+    /// the email before needing to inspect its meta.
+    /// But for now we are seeking the most basic/stupid algorithm.
+    pub fn query_scope(&self) -> QueryScope {
+        use SearchKey::*;
+        match self.0 {
+            // Combinators
+            And(and_list) => and_list
+                .as_ref()
+                .iter()
+                .fold(QueryScope::Index, |prev, sk| {
+                    prev.union(&Criteria(sk).query_scope())
+                }),
+            Not(inner) => Criteria(inner).query_scope(),
+            Or(left, right) => Criteria(left)
+                .query_scope()
+                .union(&Criteria(right).query_scope()),
+            All => QueryScope::Index,
+
+            // IMF Headers
+            Bcc(_) | Cc(_) | From(_) | Header(..) | SentBefore(_) | SentOn(_) | SentSince(_)
+            | Subject(_) | To(_) => QueryScope::Partial,
+            // Internal Date is also stored in MailMeta
+            Before(_) | On(_) | Since(_) => QueryScope::Partial,
+            // Message size is also stored in MailMeta
+            Larger(_) | Smaller(_) => QueryScope::Partial,
+            // Text and Body require that we fetch the full content!
+            Text(_) | Body(_) => QueryScope::Full,
+
+            _ => QueryScope::Index,
+        }
+    }
+
+    pub fn is_modseq(&self) -> bool {
+        use SearchKey::*;
+        match self.0 {
+            And(and_list) => and_list
+                .as_ref()
+                .iter()
+                .any(|child| Criteria(child).is_modseq()),
+            Or(left, right) => Criteria(left).is_modseq() || Criteria(right).is_modseq(),
+            Not(child) => Criteria(child).is_modseq(),
+            ModSeq { .. } => true,
+            _ => false,
+        }
+    }
+
+    /// Returns emails that we now for sure we want to keep
+    /// but also a second list of emails we need to investigate further by
+    /// fetching some remote data
+    pub fn filter_on_idx<'b>(
+        &self,
+        midx_list: &[&'b MailIndex<'b>],
+    ) -> (Vec<&'b MailIndex<'b>>, Vec<&'b MailIndex<'b>>) {
+        let (p1, p2): (Vec<_>, Vec<_>) = midx_list
+            .iter()
+            .map(|x| (x, self.is_keep_on_idx(x)))
+            .filter(|(_midx, decision)| decision.is_keep())
+            .map(|(midx, decision)| (*midx, decision))
+            .partition(|(_midx, decision)| matches!(decision, PartialDecision::Keep));
+
+        let to_keep = p1.into_iter().map(|(v, _)| v).collect();
+        let to_fetch = p2.into_iter().map(|(v, _)| v).collect();
+        (to_keep, to_fetch)
+    }
+
+    // ----
+
+    /// Here we are doing a partial filtering: we do not have access
+    /// to the headers or to the body, so every time we encounter a rule
+    /// based on them, we need to keep it.
+    ///
+    /// @TODO Could be optimized on a per-email basis by also returning the QueryScope
+    /// when more information is needed!
+    fn is_keep_on_idx(&self, midx: &MailIndex) -> PartialDecision {
+        use SearchKey::*;
+        match self.0 {
+            // Combinator logic
+            And(expr_list) => expr_list
+                .as_ref()
+                .iter()
+                .fold(PartialDecision::Keep, |acc, cur| {
+                    acc.and(&Criteria(cur).is_keep_on_idx(midx))
+                }),
+            Or(left, right) => {
+                let left_decision = Criteria(left).is_keep_on_idx(midx);
+                let right_decision = Criteria(right).is_keep_on_idx(midx);
+                left_decision.or(&right_decision)
+            }
+            Not(expr) => Criteria(expr).is_keep_on_idx(midx).not(),
+            All => PartialDecision::Keep,
+
+            // Sequence logic
+            maybe_seq if is_sk_seq(maybe_seq) => is_keep_seq(maybe_seq, midx).into(),
+            maybe_flag if is_sk_flag(maybe_flag) => is_keep_flag(maybe_flag, midx).into(),
+            ModSeq {
+                metadata_item,
+                modseq,
+            } => is_keep_modseq(metadata_item, modseq, midx).into(),
+
+            // All the stuff we can't evaluate yet
+            Bcc(_) | Cc(_) | From(_) | Header(..) | SentBefore(_) | SentOn(_) | SentSince(_)
+            | Subject(_) | To(_) | Before(_) | On(_) | Since(_) | Larger(_) | Smaller(_)
+            | Text(_) | Body(_) => PartialDecision::Postpone,
+
+            unknown => {
+                tracing::error!("Unknown filter {:?}", unknown);
+                PartialDecision::Discard
+            }
+        }
+    }
+
+    /// @TODO we re-eveluate twice the same logic. The correct way would be, on each pass,
+    /// to simplify the searck query, by removing the elements that were already checked.
+    /// For example if we have AND(OR(seqid(X), body(Y)), body(X)), we can't keep for sure
+    /// the email, as body(x) might be false. So we need to check it. But as seqid(x) is true,
+    /// we could simplify the request to just body(x) and truncate the first OR. Today, we are
+    /// not doing that, and thus we reevaluate everything.
+    pub fn is_keep_on_query(&self, mail_view: &MailView) -> bool {
+        use SearchKey::*;
+        match self.0 {
+            // Combinator logic
+            And(expr_list) => expr_list
+                .as_ref()
+                .iter()
+                .all(|cur| Criteria(cur).is_keep_on_query(mail_view)),
+            Or(left, right) => {
+                Criteria(left).is_keep_on_query(mail_view)
+                    || Criteria(right).is_keep_on_query(mail_view)
+            }
+            Not(expr) => !Criteria(expr).is_keep_on_query(mail_view),
+            All => true,
+
+            //@FIXME Reevaluating our previous logic...
+            maybe_seq if is_sk_seq(maybe_seq) => is_keep_seq(maybe_seq, &mail_view.in_idx),
+            maybe_flag if is_sk_flag(maybe_flag) => is_keep_flag(maybe_flag, &mail_view.in_idx),
+            ModSeq {
+                metadata_item,
+                modseq,
+            } => is_keep_modseq(metadata_item, modseq, &mail_view.in_idx).into(),
+
+            // Filter on mail meta
+            Before(search_naive) => match mail_view.stored_naive_date() {
+                Ok(msg_naive) => &msg_naive < search_naive.as_ref(),
+                _ => false,
+            },
+            On(search_naive) => match mail_view.stored_naive_date() {
+                Ok(msg_naive) => &msg_naive == search_naive.as_ref(),
+                _ => false,
+            },
+            Since(search_naive) => match mail_view.stored_naive_date() {
+                Ok(msg_naive) => &msg_naive > search_naive.as_ref(),
+                _ => false,
+            },
+
+            // Message size is also stored in MailMeta
+            Larger(size_ref) => {
+                mail_view
+                    .query_result
+                    .metadata()
+                    .expect("metadata were fetched")
+                    .rfc822_size
+                    > *size_ref as usize
+            }
+            Smaller(size_ref) => {
+                mail_view
+                    .query_result
+                    .metadata()
+                    .expect("metadata were fetched")
+                    .rfc822_size
+                    < *size_ref as usize
+            }
+
+            // Filter on well-known headers
+            Bcc(txt) => mail_view.is_header_contains_pattern(&b"bcc"[..], txt.as_ref()),
+            Cc(txt) => mail_view.is_header_contains_pattern(&b"cc"[..], txt.as_ref()),
+            From(txt) => mail_view.is_header_contains_pattern(&b"from"[..], txt.as_ref()),
+            Subject(txt) => mail_view.is_header_contains_pattern(&b"subject"[..], txt.as_ref()),
+            To(txt) => mail_view.is_header_contains_pattern(&b"to"[..], txt.as_ref()),
+            Header(hdr, txt) => mail_view.is_header_contains_pattern(hdr.as_ref(), txt.as_ref()),
+
+            // Filter on Date header
+            SentBefore(search_naive) => mail_view
+                .imf()
+                .map(|imf| imf.naive_date().ok())
+                .flatten()
+                .map(|msg_naive| &msg_naive < search_naive.as_ref())
+                .unwrap_or(false),
+            SentOn(search_naive) => mail_view
+                .imf()
+                .map(|imf| imf.naive_date().ok())
+                .flatten()
+                .map(|msg_naive| &msg_naive == search_naive.as_ref())
+                .unwrap_or(false),
+            SentSince(search_naive) => mail_view
+                .imf()
+                .map(|imf| imf.naive_date().ok())
+                .flatten()
+                .map(|msg_naive| &msg_naive > search_naive.as_ref())
+                .unwrap_or(false),
+
+            // Filter on the full content of the email
+            Text(txt) => mail_view
+                .content
+                .as_msg()
+                .map(|msg| {
+                    msg.raw_part
+                        .windows(txt.as_ref().len())
+                        .any(|win| win == txt.as_ref())
+                })
+                .unwrap_or(false),
+            Body(txt) => mail_view
+                .content
+                .as_msg()
+                .map(|msg| {
+                    msg.raw_body
+                        .windows(txt.as_ref().len())
+                        .any(|win| win == txt.as_ref())
+                })
+                .unwrap_or(false),
+
+            unknown => {
+                tracing::error!("Unknown filter {:?}", unknown);
+                false
+            }
+        }
+    }
+}
+
+// ---- Sequence things ----
+fn sequence_set_all() -> SequenceSet {
+    SequenceSet::from(Sequence::Range(
+        SeqOrUid::Value(NonZeroU32::MIN),
+        SeqOrUid::Asterisk,
+    ))
+}
+
+// This is wrong as sequences can overlap
+fn approx_sequence_set_size(seq_set: &SequenceSet) -> u64 {
+    seq_set.0.as_ref().iter().fold(0u64, |acc, seq| {
+        acc.saturating_add(approx_sequence_size(seq))
+    })
+}
+
+// This is wrong as sequence UID can have holes,
+// as we don't know the number of messages in the mailbox also
+// we gave to guess
+fn approx_sequence_size(seq: &Sequence) -> u64 {
+    match seq {
+        Sequence::Single(_) => 1,
+        Sequence::Range(SeqOrUid::Asterisk, _) | Sequence::Range(_, SeqOrUid::Asterisk) => u64::MAX,
+        Sequence::Range(SeqOrUid::Value(x1), SeqOrUid::Value(x2)) => {
+            let x2 = x2.get() as i64;
+            let x1 = x1.get() as i64;
+            (x2 - x1).abs().try_into().unwrap_or(1)
+        }
+    }
+}
+
+// --- Partial decision things ----
+
+enum PartialDecision {
+    Keep,
+    Discard,
+    Postpone,
+}
+impl From<bool> for PartialDecision {
+    fn from(x: bool) -> Self {
+        match x {
+            true => PartialDecision::Keep,
+            _ => PartialDecision::Discard,
+        }
+    }
+}
+impl PartialDecision {
+    fn not(&self) -> Self {
+        match self {
+            Self::Keep => Self::Discard,
+            Self::Discard => Self::Keep,
+            Self::Postpone => Self::Postpone,
+        }
+    }
+
+    fn or(&self, other: &Self) -> Self {
+        match (self, other) {
+            (Self::Keep, _) | (_, Self::Keep) => Self::Keep,
+            (Self::Postpone, _) | (_, Self::Postpone) => Self::Postpone,
+            (Self::Discard, Self::Discard) => Self::Discard,
+        }
+    }
+
+    fn and(&self, other: &Self) -> Self {
+        match (self, other) {
+            (Self::Discard, _) | (_, Self::Discard) => Self::Discard,
+            (Self::Postpone, _) | (_, Self::Postpone) => Self::Postpone,
+            (Self::Keep, Self::Keep) => Self::Keep,
+        }
+    }
+
+    fn is_keep(&self) -> bool {
+        !matches!(self, Self::Discard)
+    }
+}
+
+// ----- Search Key things ---
+fn is_sk_flag(sk: &SearchKey) -> bool {
+    use SearchKey::*;
+    match sk {
+        Answered | Deleted | Draft | Flagged | Keyword(..) | New | Old | Recent | Seen
+        | Unanswered | Undeleted | Undraft | Unflagged | Unkeyword(..) | Unseen => true,
+        _ => false,
+    }
+}
+
+fn is_keep_flag(sk: &SearchKey, midx: &MailIndex) -> bool {
+    use SearchKey::*;
+    match sk {
+        Answered => midx.is_flag_set("\\Answered"),
+        Deleted => midx.is_flag_set("\\Deleted"),
+        Draft => midx.is_flag_set("\\Draft"),
+        Flagged => midx.is_flag_set("\\Flagged"),
+        Keyword(kw) => midx.is_flag_set(kw.inner()),
+        New => {
+            let is_recent = midx.is_flag_set("\\Recent");
+            let is_seen = midx.is_flag_set("\\Seen");
+            is_recent && !is_seen
+        }
+        Old => {
+            let is_recent = midx.is_flag_set("\\Recent");
+            !is_recent
+        }
+        Recent => midx.is_flag_set("\\Recent"),
+        Seen => midx.is_flag_set("\\Seen"),
+        Unanswered => {
+            let is_answered = midx.is_flag_set("\\Recent");
+            !is_answered
+        }
+        Undeleted => {
+            let is_deleted = midx.is_flag_set("\\Deleted");
+            !is_deleted
+        }
+        Undraft => {
+            let is_draft = midx.is_flag_set("\\Draft");
+            !is_draft
+        }
+        Unflagged => {
+            let is_flagged = midx.is_flag_set("\\Flagged");
+            !is_flagged
+        }
+        Unkeyword(kw) => {
+            let is_keyword_set = midx.is_flag_set(kw.inner());
+            !is_keyword_set
+        }
+        Unseen => {
+            let is_seen = midx.is_flag_set("\\Seen");
+            !is_seen
+        }
+
+        // Not flag logic
+        _ => unreachable!(),
+    }
+}
+
+fn is_sk_seq(sk: &SearchKey) -> bool {
+    use SearchKey::*;
+    match sk {
+        SequenceSet(..) | Uid(..) => true,
+        _ => false,
+    }
+}
+fn is_keep_seq(sk: &SearchKey, midx: &MailIndex) -> bool {
+    use SearchKey::*;
+    match sk {
+        SequenceSet(seq_set) => seq_set
+            .0
+            .as_ref()
+            .iter()
+            .any(|seq| midx.is_in_sequence_i(seq)),
+        Uid(seq_set) => seq_set
+            .0
+            .as_ref()
+            .iter()
+            .any(|seq| midx.is_in_sequence_uid(seq)),
+        _ => unreachable!(),
+    }
+}
+
+fn is_keep_modseq(
+    filter: &Option<MetadataItemSearch>,
+    modseq: &NonZeroU64,
+    midx: &MailIndex,
+) -> bool {
+    if filter.is_some() {
+        tracing::warn!(filter=?filter, "Ignoring search metadata filter as it's not supported yet");
+    }
+    modseq <= &midx.modseq
+}
diff --git a/aero-proto/src/imap/session.rs b/aero-proto/src/imap/session.rs
new file mode 100644
index 0000000..92b5eb6
--- /dev/null
+++ b/aero-proto/src/imap/session.rs
@@ -0,0 +1,175 @@
+use anyhow::{anyhow, bail, Context, Result};
+use imap_codec::imap_types::{command::Command, core::Tag};
+
+use aero_user::login::ArcLoginProvider;
+
+use crate::imap::capability::{ClientCapability, ServerCapability};
+use crate::imap::command::{anonymous, authenticated, selected};
+use crate::imap::flow;
+use crate::imap::request::Request;
+use crate::imap::response::{Response, ResponseOrIdle};
+
+//-----
+pub struct Instance {
+    pub login_provider: ArcLoginProvider,
+    pub server_capabilities: ServerCapability,
+    pub client_capabilities: ClientCapability,
+    pub state: flow::State,
+}
+impl Instance {
+    pub fn new(login_provider: ArcLoginProvider, cap: ServerCapability) -> Self {
+        let client_cap = ClientCapability::new(&cap);
+        Self {
+            login_provider,
+            state: flow::State::NotAuthenticated,
+            server_capabilities: cap,
+            client_capabilities: client_cap,
+        }
+    }
+
+    pub async fn request(&mut self, req: Request) -> ResponseOrIdle {
+        match req {
+            Request::IdleStart(tag) => self.idle_init(tag),
+            Request::IdlePoll => self.idle_poll().await,
+            Request::ImapCommand(cmd) => self.command(cmd).await,
+        }
+    }
+
+    pub fn idle_init(&mut self, tag: Tag<'static>) -> ResponseOrIdle {
+        // Build transition
+        //@FIXME the notifier should be hidden inside the state and thus not part of the transition!
+        let transition = flow::Transition::Idle(tag.clone(), tokio::sync::Notify::new());
+
+        // Try to apply the transition and get the stop notifier
+        let maybe_stop = self
+            .state
+            .apply(transition)
+            .context("IDLE transition failed")
+            .and_then(|_| {
+                self.state
+                    .notify()
+                    .ok_or(anyhow!("IDLE state has no Notify object"))
+            });
+
+        // Build an appropriate response
+        match maybe_stop {
+            Ok(stop) => ResponseOrIdle::IdleAccept(stop),
+            Err(e) => {
+                tracing::error!(err=?e, "unable to init idle due to a transition error");
+                //ResponseOrIdle::IdleReject(tag)
+                let no = Response::build()
+                    .tag(tag)
+                    .message(
+                        "Internal error, processing command triggered an illegal IMAP state transition",
+                    )
+                    .no()
+                    .unwrap();
+                ResponseOrIdle::IdleReject(no)
+            }
+        }
+    }
+
+    pub async fn idle_poll(&mut self) -> ResponseOrIdle {
+        match self.idle_poll_happy().await {
+            Ok(r) => r,
+            Err(e) => {
+                tracing::error!(err=?e, "something bad happened in idle");
+                ResponseOrIdle::Response(Response::bye().unwrap())
+            }
+        }
+    }
+
+    pub async fn idle_poll_happy(&mut self) -> Result<ResponseOrIdle> {
+        let (mbx, tag, stop) = match &mut self.state {
+            flow::State::Idle(_, ref mut mbx, _, tag, stop) => (mbx, tag.clone(), stop.clone()),
+            _ => bail!("Invalid session state, can't idle"),
+        };
+
+        tokio::select! {
+            _ = stop.notified() => {
+                self.state.apply(flow::Transition::UnIdle)?;
+                return Ok(ResponseOrIdle::Response(Response::build()
+                    .tag(tag.clone())
+                    .message("IDLE completed")
+                    .ok()?))
+            },
+            change = mbx.idle_sync() => {
+                tracing::debug!("idle event");
+                return Ok(ResponseOrIdle::IdleEvent(change?));
+            }
+        }
+    }
+
+    pub async fn command(&mut self, cmd: Command<'static>) -> ResponseOrIdle {
+        // Command behavior is modulated by the state.
+        // To prevent state error, we handle the same command in separate code paths.
+        let (resp, tr) = match &mut self.state {
+            flow::State::NotAuthenticated => {
+                let ctx = anonymous::AnonymousContext {
+                    req: &cmd,
+                    login_provider: &self.login_provider,
+                    server_capabilities: &self.server_capabilities,
+                };
+                anonymous::dispatch(ctx).await
+            }
+            flow::State::Authenticated(ref user) => {
+                let ctx = authenticated::AuthenticatedContext {
+                    req: &cmd,
+                    server_capabilities: &self.server_capabilities,
+                    client_capabilities: &mut self.client_capabilities,
+                    user,
+                };
+                authenticated::dispatch(ctx).await
+            }
+            flow::State::Selected(ref user, ref mut mailbox, ref perm) => {
+                let ctx = selected::SelectedContext {
+                    req: &cmd,
+                    server_capabilities: &self.server_capabilities,
+                    client_capabilities: &mut self.client_capabilities,
+                    user,
+                    mailbox,
+                    perm,
+                };
+                selected::dispatch(ctx).await
+            }
+            flow::State::Idle(..) => Err(anyhow!("can not receive command while idling")),
+            flow::State::Logout => Response::build()
+                .tag(cmd.tag.clone())
+                .message("No commands are allowed in the LOGOUT state.")
+                .bad()
+                .map(|r| (r, flow::Transition::None)),
+        }
+        .unwrap_or_else(|err| {
+            tracing::error!("Command error {:?} occured while processing {:?}", err, cmd);
+            (
+                Response::build()
+                    .to_req(&cmd)
+                    .message("Internal error while processing command")
+                    .bad()
+                    .unwrap(),
+                flow::Transition::None,
+            )
+        });
+
+        if let Err(e) = self.state.apply(tr) {
+            tracing::error!(
+                "Transition error {:?} occured while processing on command {:?}",
+                e,
+                cmd
+            );
+            return ResponseOrIdle::Response(Response::build()
+                .to_req(&cmd)
+                .message(
+                    "Internal error, processing command triggered an illegal IMAP state transition",
+                )
+                .bad()
+                .unwrap());
+        }
+        ResponseOrIdle::Response(resp)
+
+        /*match &self.state {
+            flow::State::Idle(_, _, _, _, n) => ResponseOrIdle::StartIdle(n.clone()),
+            _ => ResponseOrIdle::Response(resp),
+        }*/
+    }
+}