When i enter Usermin, i get this:
An error occurred listing mail in this folder : Failed to login to POP3 server : Internal error occurred. Refer to server log for more information
This is in /var/log/mail.err
Jan 14 11:30:02 ******** dovecot: IMAP(kone.*****): mkdir(/var/lib/dovecot/control/kone.****/.INBOX) failed: Permission denied