Internal quota calculation error (redis), double mail delivery

[Tom Sommer]

Sometimes my redis connection times out, both for pop3, imap and lmtp. I 
have no idea why, when I do a "doveadm quota recalc -u" it works just 
fine?
I'm thinking the connection is lost somehow and not retried?

Apr 06 15:42:00 lmtp(xxx at xxx.com): Error: redis: Lookup timed out in 
30.000 secs
Apr 06 15:42:00 lmtp(xxx at xxx.com): Error: Internal quota calculation 
error
Apr 06 15:42:00 lmtp(xxx at xxx.com): Error: Internal quota calculation 
error
Apr 06 15:42:00 lmtp(xxx at xxx.com): Info: xxxx: msgid=<xxxx at xxxx.com>: 
saved mail to INBOX
Apr 06 15:49:23 lmtp(xxx at xxx.com): Info: xxxx: msgid=<xxxx at xxxx.com>: 
saved mail to INBOX <-- Same mail

This happens a lot, and it's really bad, because the mail is actually 
saved correctly, but the error is reported back to the Director, causing 
the delivery to be retried by the MTA - so the mail actually lands 
*twice* in the user's inbox.

Thanks

-- 
Tom