On 10.6.2007, at 23.10, Bernd Kuhls wrote:
This mailbox is snarfed by Dovecot each time the Inbox is opened, because the mail is not deleted from /var/mail$user, although Dovecot successfully snarfed the mail to /home/$user/.imap_mail/inbox. /home/$user is not overquota.
Check your error log. I'm pretty sure there's something in there (http://wiki.dovecot.org/Logging).
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