Comment 4 for bug 1018579

As stated on IRC, I did a minimal regression check, getting a precise container working with postfix and dovecot, sending a couple of test e-mails, retrieving them from dovecot, then upgrading to the new packages and testing again.

The race is apparently difficult to hit and doesn't have a clear test case. The patch was taken from upstream so it's hopefully sane.
Marking this bug verification-done on the basis that it's been waiting for almost 30 days and doesn't show any sign of regression.