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Dovecot no longer delivering LMTP mail or allowing access to InboxesMonday 31st October 2016
I just happened to email myself a reminder from my work account to my home address - it got bounced - strange.

A check of my mail logs were being filled with Postfix errors:
postfix/lmtp[6991]: AB7792880B: to=, relay=myserver.mydomain[/var/run/dovecot/lmtp], delay=1197, delays=1197/0.02/0.03/0.03, dsn=4.2.0, status=deferred (host myserver.mydomain[/var/run/dovecot/lmtp] said: 451 4.2.0  Permission denied (in reply to end of DATA command))

It seems there was an update done to openSUSE (patch openSUSE-2016-1249) that affected the Dovecot package.

Once again, BTRFS snapshots saved the day. I spent some time comparing the difference before and after the patch and found that permissions had been changed on the dovecot directory. /var/lib/dovecot previously had 755 and it had changed to 750. Switching the permissions back resulted in everything kicking into life.

A couple of handy commands learnt during this time

List recent patches: zypper search -t patch
View details of a patch: zypper info -t patch openSUSE-2016-1249

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