Dovecot 2.2.16: disappearing messages, mismatched summaries, duplicated messages, excessive full re-downloads

[Timo Sirainen]

On 16 Apr 2015, at 04:45, David Gessel <gessel at blackrosetech.com> wrote:
> 
> My Dovecot 2.2.16 server is interacting poorly with a variety of mail clients.  The symptoms include disappearing messages, mismatched summaries, duplicated messages, and excessive full re-downloads.

What were you running before Dovecot v2.2.16? An earlier Dovecot? A whole different system?

> dovecot.log shows runs of this error:
> Apr 15 09:02:37 imap(user at domain.com): Warning: Maildir /mail/domain.com/user//.Sent: Expunged message reappeared, giving a new UID (old uid=306286, file=1429102024.M826331P1156.host,S=1678,W=1724:2,S)
> 
> or this error:
> Apr 15 10:04:00 indexer-worker(user at domain.com): Warning: Maildir /mail/domain.com/user//.Sent: Expunged message reappeared, giving a new UID (old uid=306803, file=1428785463.M645546P27215.host,S=5389,W=5442:2,S)
..
> The first entry in dovecot.log.0 is at Apr 15 10:00:12, and the last entry at Apr 15 12:00:13; Dovecot is logging 4,490 expunged message reappeared messages per hour.  Note the server has 4 accounts set up and very limited traffic, so 4,490 per hour would seem like a lot of anything to be logged.

These really shouldn't be happening..