Configuration problem for secure virtual server

[Karsten Malcher]

I can only login when i alter the group to crypt.
But then dovecot has the problem that it is not in group mail:

Dec 15 18:33:39 imap(karsten at server): Error: fchown(/mountpoint/mail/server/karsten/dovecot-uidlist.tmp, group=8(mail))
failed: Operation not permitted (egid=9(crypt), group based on /mountpoint/mail/server/karsten - see
http://wiki2.dovecot.org/Errors/ChgrpNoPerm)

So dovecot will not handle different groups in the path !?