[Dovecot] id/permissions question

[Kārlis Repsons]

People,

There is an imap client, which runs with user1 uid, but when its accessed to 
watch a maildir, whose (and its contents) ownership is user1:user1, this error 
occurs:

dovecot: IMAP(user1): fchown(/path/user1/dovecot-uidlist.tmp, -1, 12(mail)) 
failed: Operation not permitted (egid=1000(user1), group based on /path/user1)

dovecot.conf contains this line: mail_privileged_group = mail
authentication happens through passwd-file, where for user1 its uid and gid are 
specified as in /etc/passwd and /etc/group.

So how should dovecot be told to use user1 group instead of mail group? (or it 
needs some other solution?)
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