Am 18.04.22 um 21:02 schrieb Bill Cole via mailop:
On 2022-04-18 at 13:32:07 UTC-0400 (Mon, 18 Apr 2022 12:32:07 -0500)
Larry M. Smith via mailop <mailop....@fahq2.com>
is rumored to have said:
...
I'm going to disagree. To the best of my knowledge Yahoo, Vz, AOL, or
Microsoft do NOT re-queue messages after receiving a 5xx response -- Qmail does.
Did you mean "GMail?"
FWIW, I've not seen GMail (or Qmail) do that. Do you know how to reproduce it?
I have a current sample where GMail did this. They apparently do it for 5.7.1 responses to DATA only, and not always,
but I don't have complete statistics for this.
Here are the log entries for the recent run (which were rejected after DATA due to a known-spammer body pattern, which
is one possible way to keep the ever-changing GMail 4-1-9ers somewhat in check.) Note that identical message ID provies
that this isn't the spammer repeatedly trying to get his/her fraud message across, but Google trying to force the spam
down our throat :-)
Apr 18 19:43:34 mail postfix/cleanup[23243]: 7D1D4120D85:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 19:50:22 mail postfix/cleanup[24996]: 7C34B120D72:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 20:13:48 mail postfix/cleanup[27908]: 8189A120D84:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 20:40:41 mail postfix/cleanup[459]: 059EB120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 21:25:48 mail postfix/cleanup[15781]: DAAD7120D74:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 22:16:56 mail postfix/cleanup[28107]: 43595120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 18 23:43:07 mail postfix/cleanup[14675]: 0F230120D30:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 19 01:13:13 mail postfix/cleanup[25151]: 50B47120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 19 02:44:45 mail postfix/cleanup[9739]: 23C56120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 19 04:30:16 mail postfix/cleanup[29190]: 74078120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
Apr 19 06:18:44 mail postfix/cleanup[16471]: D7F3B120D0C:
message-id=<CABM=+iq7b5m1hnu1tn+xqrdca2hez6ufkrmqgugu19fih8y...@mail.gmail.com>
When I detect those in the logs I add the MAIL FROM address to the known-spammer list, which causes the mail to be
rejected earlier in the SMTP dialogue and seems to stop the retries. Most times I don't care whether they're retrying
repeatedly, though, it costs more of their resources than mine.
Cheers,
Hans-Martin
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