We are getting weird mailbox quota issues. The mailbox quota for a particular Virtual host and it's users were set to 10GB for the whole domain and 500mb per user. Some users hit this and the server started burking with the response "status=bounced (can't create user output file)" for incoming email and IMAP quota messages on the client side. So I made the domain and user quotas unlimited, however that was 5 days ago but it appears that the issue has cropped up again. The mail server logs contain entries like this:
Jul 19 15:23:47 host2 dovecot: IMAP(firstname.lastname@example.org): write_full(/home/domaine.com/homes/user/Maildir/dovecot-uidlist.lock) failed: Disk quota exceeded Jul 19 15:27:14 host2 postfix/local: 243193718281: to=<email@example.com@host.mailhostdomain.com>, firstname.lastname@example.org, relay=local, delay=0.63, delays=0.01/0/0/0.62, dsn=5.2.0, status=bounced (can't create user output file)
I've just disabled the system quotas completely and everything is back to normal. I'd imagine that if I re-enable or restart the server these issue may come back.
Centos 5.5 Latest Virtualmin with Pro license
I've seen quite a few similar issues like this here, but with no solutions.