Re: LMTP error: Too many concurrent deliveries for user (in reply to end of DATA command)

[Reindl Harald]

Am 06.03.2015 um 14:44 schrieb Ralf Hildebrandt:

I updated dovecot today and all over a sudden I'm getting:

Mar 6 14:40:46 mail postfix/lmtp[3150]: 3kz95y3nX3zCtTS: 
to=<recipient@backup.invalid>, relay=127.0.0.1[private/dovecot-lmtp],
delay=88, delays=87/0.94/0.01/0.01, dsn=4.3.0, status=deferred (host 
127.0.0.1[private/dovecot-lmtp] said: 451 4.3.0
<recipient@backup.invalid> Too many concurrent deliveries for user (in reply to 
end of DATA command))

Why is that? Which setting must I tweak?

lmtp_destination_concurrency_limit on postfix side

lmtp_destination_concurrency_limit = $default_destination_concurrency_limit

postconf -d default_destination_concurrency_limit
default_destination_concurrency_limit = 20

don't overload your storage by a high busy queue combined with to much parallel delivery to the mailstorage - thins don't get really faster that way

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