From: Moderator-Address <moderator> Content-Type: multipart/digest; boundary=1; --1 From: someone-else <someone@else> Subject: my opinion This is my opinion --1 From: another one <another@one> Subject: i disagree Not agreeing one bit! --1 From: attachment <attachment@user> Subject: funny hat Content-Type: multipart/mixed; boundary=2 --2 Content-Type: text/plain Content-Transfer-Encoding: binary Lovely attachment for you --2 Content-Type: application/octet-stream; disposition=attachment; name="test.txt" Content-Transfer-Encoding: binary Foobar --2-- --1--