* Ralf Hildebrandt <Ralf.Hildebrandt@charite.de>:

> > Are you also looking at what errors are in the valgrind log? It might
> > prevent the crashes. Does grep find any of:
> > 
> > Invalid free() / delete / delete[]
> > Invalid read of size
> > Invalid write of size
> > bytes inside a block of size
> 
> root@postamt:/tmp# egrep -i "(invalid|inside)" imap-login.*
> root@postamt:/tmp# 

Got one now:
Jan 16 01:04:42 postamt dovecot: child 10780 (login) returned error 1 (latest ip=84.191.241.127)

Looking at /tmp/imap-login.10780 (attached!) I get:

$ egrep -i "(invalid|inside)" /tmp/imap-login.10780 
==10780== Invalid write of size 1
==10780== Invalid write of size 1
==10780== Invalid write of size 1
==10780== Invalid write of size 1


-- 
Ralf Hildebrandt (Ralf.Hildebrandt@charite.de)          snickebo@charite.de
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
I work for an investment bank. I have dealt with code written by stock
exchanges. I have seen how the computer systems that store your money
are run. If I ever make a fortune, I will store it in gold bullion
under my bed.