On Fri, 2010-12-10 at 11:00 +0000, James Lee wrote: > Dec 9 23:20:38 mailhost dovecot: [ID 583609 mail.crit] lda(user at domain.co.uk): Panic: stream doesn't support seeking backwards Fixed now: http://hg.dovecot.org/dovecot-2.0/rev/89936539e3b8 It also doesn't happen if you enable Sieve plugin.