On Fri, Jul 24, 2026 at 11:59:04AM +0200, Thomas Franz via Postfix-users wrote:
> Hello,
> 
> I have a config with a "slow transport", but I have examples with less than
> 5 sec in my log (see below).
> 
> Is it a wrong configuration or a wrong interpretation?
> 
> master.cf:
> 
> smtpslow  unix  -       -       n       -       1       smtp
>   -o syslog_name=postfix/slow

Misconfiguraation.  The below are queue manager parameters.

>   -o smtpslow_destination_rate_delay=5s
>   -o smtpslow_destination_concurrency_limit=1
>   -o smtpslow_destination_concurrency_failed_cohort_limit=10

They have no effect when restricted to the delivery agent.  Move these to
main.cf.

-- 
    Viktor.  🇺🇦 Слава Україні!
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