On Thu, Oct 24, 2024 at 08:57:00AM +0200, Jaroslaw Rafa via Postfix-users wrote:
> Something bad happened to the list (?), as your message seems to be repeated
> multiple times, with Chinese characters prepended to the subject and list
> footer appended to the body multiple times.
I already (~90 minutes ago) suspended list delivery for a plausible
source of the problem, and reached out to sys4.de to check their side to
ensure this is resolved. What's puzzling is why Mailman fails to stop
the loop, it should be able to detect that it is reposting the same
message.
- The Message-id is a repeat.
- The "RFC5322.From:" rewrite to <postfix-users@postfix.org>
should mean that the reposted message is not from a list member,
and should hit moderation.
* Unless of course the miscreant system is somehow "undoing" the DMARC
header sanitisation, and restoring the original "From"
address.
Perhaps a Mailman "tuneup" is possible to harden it against this sort
of loop.
--
Viktor.
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