On 2022-04-19 at 02:10:06 UTC-0400 (Tue, 19 Apr 2022 08:10:06 +0200)
Hans-Martin Mosner via mailop <[email protected]>
is rumored to have said:
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 <[email protected]>
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.
Thank you so much for the details. It gives me something to look for in
logs.
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 :-)
Hypothetically possible that the spammer resubmitted the same message
with existing MID 11 times. (unlikely)
Hypothetically possible that this indicates envelope splitting of some
sort, i.e. same message being sent to different recipients on each try.
That would be a natural approach to having recipients in multiple
domains. It would also happen if the original had n recipients but the
receiver forces one-at-a-time transfer by 4xx-ing recipients 2 through
n.
I have investigating to do...
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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--
Bill Cole
[email protected] or [email protected]
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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