Thanks for the very detailed walkthough!
Let’s focus on this message sent to the mailing list topic.
The rejected post log incident headers show this:
Message-ID: <20260103080033.5f6d8f90@dorfdsl.de>
Date: Sat, 03 Jan 2026 08:00:33 +0100
From: Marco Moock via tor-relays <tor-relays@lists.torproject.org>
To: tor-relays@lists.torproject.org
Subject: [tor-relays] Re: Questions about running an exit relay
The full rejection reason text is this:
We're sorry, but your email message to ["tor-relays@lists.torproject.org"] (titled [tor-relays] Re: Questions about running an exit relay) didn't work.
Reason:
Something has gone wrong. Perhaps this topic was closed or deleted while you were looking at it?
If you can correct the problem, please try again.
The plaintext record of the email sent to Discourse from Mailman (IncomingEmail) is available here (I don’t believe it contains any data that’s not already public, but anyway I set that link to expire eventually).
Unfortunately my attempts to extract the EmailLog could not produce any result: it seems like Discourse doesn’t have such a record for that message.