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/postfix-users@postfix.org/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. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org