Thanks,I did realize after I sent the email that what was probably happening 
was the delay was the overiding controller, and not working as in addition as I 
thought it would.

Is there a way to do combine the delay w/ the concurrency?

Like two simultaneous connections each doing one email per rate delay?

I'm trying to help some folks out w/ sending to yahoo and trying to see what 
options I have as far as rate control.
________________________________
From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> on 
behalf of Wietse Venema <wie...@porcupine.org>
Sent: Tuesday, January 17, 2023 7:17 PM
To: Postfix users <postfix-users@postfix.org>
Subject: Re: Understanding concurrency limits

Sean Hennessey:
> In master.cf
> smtp-tar unix  -        -       y       -       1       smtp
>         -o syslog_name=postfix/$service_name
>
> In main.cf
> smtp-tar_destination_rate_delay = 600s

RTFM, this puts 600s delay between deliveries as in:

deliver one meessage
wait 600s
deliver one meessage
etc.

The scheuler could warn when concurrency >1 will be ignored, but
given that "default_destination_concurrency_limit = 20", that would
create a lot of noise.

        Wietse

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