On Sun, Aug 27, 2023 at 03:13:43AM -0400, Wietse Venema via Postfix-users wrote:
> Bill Sommerfeld via Postfix-users:
> > About three years ago there was a thread on postfix-users ("Comcast 421
> > throttling multiple recipients") discussing a low-traffic site having
> > difficulties sending to multiple recipients at comcast in a single smtp
> > session. The thread starts here:
> >
> > https://www.mail-archive.com/[email protected]/msg88394.html
> >
> > and it appears to have died out without consensus on what was going on.
> >
> > I believe I understand what the original poster was seeing because it
> > just happened to me. Having a way to disable the special per-recipient
> > behavior when ${transport}_destination_recipient_limit=1 would be very
> > useful in working around quirky receiver like this.
>
> Would it be sufficient to never send more than 1 recipient per
> mesage, thus never trigger their temporary "block all mail" strategy,
> and avoid the need for the kludges described here?
Meanwhile, I pinged to a Comcast contact. He mentioned that they're
reachable via the "mailop" list, and may perhaps consider loosening the
limits a bit. I hope that'll happen, and small Postfix systems with
neutral/unknown "reputation" wouldn't have to jump through excessive
hoops just to deliver an occasional multi-recipient message.
--
Viktor.
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