dovecot - Mar 2015 - LMTP error: Too many concurrent deliveries for user (in reply to end of DATA command)

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?

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* Ralf Hildebrandt <r at sys4.de>:
> 
> I updated dovecot today and all over a sudden I'm getting:
Old:
dovecot-lmtpd:amd64 2:2.2.15-1~auto+136

New:
dovecot-lmtpd:amd64 2:2.2.15-1~auto+148
>From Stephan Bosch's repos.
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* Ralf Hildebrandt <r at sys4.de>:
> * Ralf Hildebrandt <r at sys4.de>:
> > 
> > I updated dovecot today and all over a sudden I'm getting:
> 
> Old:
> dovecot-lmtpd:amd64 2:2.2.15-1~auto+136
> 
> New:
> dovecot-lmtpd:amd64 2:2.2.15-1~auto+148
> 
> From Stephan Bosch's repos.
Found the issue:

# doveconf |grep concurr
lmtp_user_concurrency_limit = 0

-> not working

# doveconf |grep concurr
lmtp_user_concurrency_limit = 10000

-> working again!

I guess 0 should disable the limit. It doesn't (anymore).

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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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* Reindl Harald <dovecot at dovecot.org>:
> lmtp_destination_concurrency_limit on postfix side
It's not a postfix issue. postfix is merely reporting what Dovecot said.
 
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On 06 Mar 2015, at 15:44, Ralf Hildebrandt <r at sys4.de>
wrote:
> 
> 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))
Oops. Fixed: http://hg.dovecot.org/dovecot-2.2/rev/9c69c197b527