testeur via Postfix-users:
> Hi,
> 
> I did a request to mailman3 ML about this question, but it seems that 
> postfix can respond to my request.
> I use mailman3. But AOL, YAHOO seems to consider emails sent to 
> recipients as spam or an "Excessively high volume of emails". There's 
> just 40 (aol, yahoo) emails suscribed to the list. i tested the list on 
> www.mail-tester.com, but 10/10.
> 
> Is there a mean to configure postfix for that emails be sent to 
> recipients in a spread out manner to avoid being considered spam ? Maybe 
> taking 10 emails from the same domain, to send it all 3 minutes until 
> that all email form the same domain be passed.

See https://www/postfix.org/QSHAPE_README.html

When a destination is unable to handle the load even after the Postfix process
limit is reduced to 1, a desperate measure is to insert brief delays between
delivery attempts.

  * Postfix version 2.5 and later:

      o In master.cf set up a dedicated clone of the "smtp" transport for the
        problem destination. In the example below we call it "slow".

      o In main.cf configure a short delay between deliveries to the same
        destination.

        /etc/postfix/main.cf:
            transport_maps = hash:/etc/postfix/transport
            slow_destination_rate_delay = 1
            slow_destination_concurrency_failed_cohort_limit = 100

        /etc/postfix/transport:
            example.com  slow:

        /etc/postfix/master.cf:
            # service type  private unpriv  chroot  wakeup  maxproc command
            slow      unix     -       -       n       -       -    smtp

Here, the delay is 1 second between deliveries. Use "postfix
reload" command sparingly, as it resets the rate delay timer. 
Use the command only when you change master.cf, or the rate delay.

        Wietse
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