On 9/18/24 09:35, Steve Brown via Mailman-users wrote:

Yes, that is what is happening, but only for messages from the steve@stevebrown 
address.  I can send a screenshot and a .txt of the headers (of the message 
after sent back to me from MM3 and long!) but didn't see a way to do that on 
the archive page.  Do I need to post from my gmail address?


The usual behavior of most MUAs (mail clients) is to set the envelope sender to the same address as From:. In that case, you won't see an issue like this. In your case, when you send via tmdhosting servers, they set that odd bounce+... address as the envelope sender, presumably so they can do something in processing DSNs returned to that address.

If you post the full headers of such a message from the list, either inline or as a .txt attachment, I'll look and say what I can.

As far as getting headers from HyperKitty is concerned, if you click on a thread containing the message, there is a Download button which will produce a gzipped mbox containing the message(s) in that thread, but the headers are very minimal - only From:, To:, Subject:, Date:, Message-ID:, MIME-Version: and Content-Type:. There is also a From_ separator, but it contains the From: address, not the true envelope sender.


One clue I hadn't spotted before was a bodyhash_mismatch warning in the 
headers.  No idea where that came from.  Doesn't appear in emails from me to 
other addresses.

Is that in Authentication-Results:? It is probably saying an original DKIM signature fails to verify because of a body mismatch which is expected if Mailman has filtered any MIME parts or added a message header or footer.

--
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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