[Dovecot] Squirrelmail: "ERROR: Connection dropped by IMAP server."

Hi,

running the current version from http://hg.dovecot.org/dovecot/ (but the same happens with 1.1.beta3) After yesterday's patches, squirrelmail (tested with 1.4.11 and 1.4.10a) complains when appending to the Sent folder (after sending a message):

ERROR: Connection dropped by IMAP server. Query: SELECT "INBOX"

dovecot's log says dovecot: IMAP(jh): Disconnected: EOF while appending bytes=12780/37798

I have captured the conversation with tcpdump (http://plonk.de/imap.cap), and it looks like dovecot is closing the connection.

With Thunderbird it works just fine.

Regards, Jakob