On Sun, Sep 22, 2024 at 07:29:30PM -0500, Greg Sims wrote:
> The only traffic we send on these ip addresses is a Bible
> Daily Devotion email using double opt-in subscriptions.
Despite the double opt-in, some receivers will report your mail as spam,
either because they fail to distinguish between "Trash" and "Junk" when
choosing to delete a message, or because they no longer wish to receive
the messages, and choose to have them filtered, rather than
unsub<nospace>scribe.
> I have written postmas...@comcast.net and never received a reply. I have
> tried several times and will try again per your suggestion.
Probably better to go the web form route:
https://postmaster.comcast.net -> https://spa.xfinity.com/report
> I can see that the number of comcast deferrals reduces when I reduce the
> arrival rate of all our outbound email to postfix. One idea is to reduce
> the delivery rate of only comcast.net email using postfix. Is this
> suggested/possible?
Yes, provided you can live with 1 message/sec or less (total under 86k
per day per transport).
# http://www.postfix.org/postconf.5.html#default_destination_rate_delay
transport_destination_rate_delay = 1
The actual parameter name depends on the name of the master.cf transport
to which you relegate comcast.net traffic. With a rate delay, the
destination concurrency is always equal to 1, (delivery spacing is
at least one second apart, so of course no concurrent deliveries).
With rate delays, consider also:
#
http://www.postfix.org/postconf.5.html#default_destination_concurrency_failed_cohort_limit
transport_destination_concurrency_failed_cohort_limit = 3
so that just a single delivery failure (failed or lost connection,
refused EHLO, ... ) does not throttle the transport. See also:
http://www.postfix.org/TUNING_README.html#rope
http://www.postfix.org/SCHEDULER_README.html#concurrency_limitations
These are qmgr(8) parameters, do not make the mistake of setting them in
master.cf as transport-specific overrides.
--
Viktor.
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