I found the bug, there are two errors: 1) Squirrelmail is wrongly formating multipart/alternative messages.
Look here: ------=_20090510163738_24160 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: 8bit a<br /> *<------ HERE* ------=_20090510163738_24160-- All other clients insert an '\n' here, but squirrelmail. 2) When this king of message (above) is compressed (in order to use zlib plugin), dovecot dies. Best Regards, Fernando
