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 at 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 at 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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