On 2025-05-11 at 18:18:00 UTC-0400 (Sun, 11 May 2025 18:18:00 -0400)
postfix--- via mailop <post...@sfina.com>
is rumored to have said:
On 2025-05-05 15:56, Nick Schafer via mailop wrote:
Just to follow up on this thread. We are actively working on abuse
reports as they come into our abuse desk each and every day.
Following up: same abuse still active a week later. This time with my
block. Log excerpt:
May 7 15:02:36 mx postfix/smtp/smtpd[32190]: NOQUEUE: reject: RCPT
from a24.a38b9138.use4.send.mailgun.net[198.244.53.24]: 554 5.7.1
<a24.a38b9138.use4.send.mailgun.net[198.244.53.24]>: Client host
rejected: only for recipient-approved transactional emails.
a24.a38b9138.use4.send.mailgun.net move on.;
On 2025-05-05 00:46, Michael Rathbun via mailop wrote:
What is an "appropriate message?" silently dropping is a message
too.
"530 4.7.0 Connection refused" does the job for me.
How is 530 different from 554? and more specifically, is there a
message that will convey to PHB that their belief that their message
is more important than recipient's choice is simply wrong?
The implication of Michael's text part is that he sends that instead of
a SMTP banner at connect time.
ANY 5xy reply should be taken as an absolute indication that the sender
must not try the same transaction again, and any extended 4.a.b code
implies that the condition could cure itself. 4.7.0 specifically says
that the problem is in authentication. The combination is a bit
incoherent, but that doesn't matter because any 5xy reply at connect
should kill at least the current message.
You can expect bulk mail ESPs to ignore, misinterpret, or intentionally
misunderstand reply codes when it is most convenient for them to do so.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo@toad.social and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire
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