Paul Tomblin via Postfix-users:
>
>
> On Fri, Jun 26, 2026, at 2:57 PM, Wietse Venema wrote:
> > Paul Tomblin via Postfix-users:
> >> slow_smtp_destination_concurrency_limit = 2
> >> slow_smtp_destination_recipient_limit = 5
> >
> > Those names don't exist. Try these:
Ah. Your master.cf has "slow_smtp" not "slow".
As for the question why these setings are not used:
- Check any parameter settings in master.cf
postconf -P | grep slow_smtp
- Be sure to execute "postfix reload" after changing scheduler
settings. Unlike most Postfix programs, the qmgr does not autoimatically
refresh.
- Provide proof that the slow_smtp transport is handling those
messages.
The _destination_concurrency_limit and _smtp_destination_recipient_limit
features are implemented by decades-old code that has not changed
$forever.
Wietse
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