On 19 May 2025, at 11:12, Sebastian Hagedorn wrote:
On 19 May 2025, at 11:02, Benny Kjær Nielsen wrote:
On 19 May 2025, at 10:52, Sebastian Hagedorn wrote:
As someone who runs a large Mailman server as my day job: Benny has
to use Mailman’s DMARC handling.
I already do that, but it's possible this issue is related. The error
messages were about DKIM failing.
OK, in that case I guess the DNS lookup failed. I’ve seen that
happen in the past. When Mailman can’t lookup the DMARC policy, the
DMARC handling doesn’t happen, leading to this issue.
That seems to indicate that even with wrapping then this would have
failed (because that would also not have been done). Meaning that I
would have to either munge all or wrap all emails.
In any case, the sender of the email triggering the issue often sends
emails to the mailing list (without munging).
Here's an example of the error message:
<x...@gmail.com>: host alt1.gmail-smtp-in.l.google.com[209.85.202.27]
said: 421-4.7.30 Your email has been rate limited because DKIM
authentication didn't 421-4.7.30 pass for this message. Gmail
requires all
bulk email senders to 421-4.7.30 authenticate with DKIM. 421-4.7.30
421-4.7.30 Authentication results: 421-4.7.30 DKIM = did not pass
421-4.7.30 To set up DKIM for your sending domains, visit
421-4.7.30
https://support.google.com/a?p=turn-on-dkim 421-4.7.30 To learn
more about
Gmail requirements for bulk senders, visit 421 4.7.30
https://support.google.com/a?p=sender-guidelines.
ffacd0b85a97d-3a35ca8c295si4754581f8f.772 - gsmtp (in reply to end
of DATA
command)
I'm not sure if this indicates that all senders on the mailing list have
to have DKIM configured for their domains now? This is not the case for
the From address involved.
--
Benny
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