http://dovecot.org/test/

• SORT command always replied with NO
• Locking fixes. Fixes several crashes, dotlock errors and deadlock errors
• When multiple sessions were concurrently modifying mailbox it often mixed up the messages that were supposed to be modified. When expunging it also gave errors such as:

Corrupted transaction log file /home/user/Maildir/.INBOX/dovecot.index.log: Expunge range 5..5: UIDs 6..6 doesn't match real UIDs 18..18

Now it doesn't do it as often, but it still does.. I'm not really sure where the bug is. Have to keep looking.

This seems much more stable than test8, but because of the above problem I still don't recommend it for more than testing.