On Sun, 2010-08-08 at 18:24 +0200, Andreas M. Kirchwitz wrote: > Aug 8 18:07:56 mailserver dovecot: imap(mailuser): Panic: file istream-header-filter.c: line 81 (read_mixed): assertion failed: (pos > 0) This is fixed by: http://hg.dovecot.org/dovecot-2.0/rev/dd3e70c85d43 http://hg.dovecot.org/dovecot-2.0/rev/f7b5732820dd