On 28 Nov 2015, at 17:14, Sytse Kuijk <sy...@pobox.com> wrote:

>I am running a Mac mini with OSX server version 10.5, that is on El Capitan, 
>but the problem I have started on Yosemite (the previous version) and did not 
>change at all in the upgrade (I had hoped it would have solved itself). … 
>Since we suffered a short power outage a little over a week ago, the mail has 
>failed in delivering messages to the local mailboxes. 

So it sounds like you ran an upgrade from Mac OS X 10.10.x and OS X Server 5.x 
or 4.x to Mac OS X 10.11.1 and OS X Server 5.0.15 in order to fix a problem 
caused by a power outage. I would suggest reverting to a backup from 
immediately before the power outage and getting it working first before trying 
to run the upgrade (and the migration it runs) - I have had OS X Server become 
unrecoverable before due to a power failure and had to rebuild from scratch. 
Upgrading could not fix the underlying problems with the state that the 
filesystem was in because there had been a data loss. This was a very painful 
experience.

Sorry this isn’t specifically Dovecot related, although I have been running 
Dovecot for years now on a live Mac OS X computer and upgraded to OS X Server 
5.0.15 recently with very few issues other than the usual Apple simplification 
complexities and the fact that the OS X Server installer took a *very* long 
time to do the migration.

Angus

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