[pfx] Re: Trying to limit the number of users per connection and the number of concurrent connections to one domain

[Paul Tomblin via Postfix-users]

On Sat, Jun 27, 2026, at 9:55 AM, Wietse Venema via Postfix-users wrote:

> You may want to specify slow_smtp_destination_rate_delay to slow things 
> further down.

Ok, I made that one change (set it to 3s), did a postfix reload, and now 
they've all got the process id, but the delay= changes every 5. After the 2nd 
batch of 5, all the subsequent batches were deferred (server temporarily 
unavailable). But it seems like when it retried, the 3rd and 4th batches went 
through with delay=490 and delay=493 respectively, but everything else delayed 
again.

I guess as long as they get through eventually without bouncing, they'll be 
happy and I'll be happy. 

Thanks for everybody's help. I've been using Postfix for decades, it seems, but 
mostly using canned solutions rather than understanding everything that's going 
on. I originally switched because when using sendmail with my mailing lists, 
one slow receiving domain would pause everybody after it in the list but 
Postfix would go on to the next one.



-- 
Paul Tomblin
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