About "Undelivered Mail Returned to Sender" when trying to respond to debbugs issues

[Zelphir Kaltstahl <zelphirkaltstahl@posteo.de>]

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Hello Guix developers!

I am not sure I am sending this to the right people, so I am sorry, if you are 
not the ones I should be sending this to. Here it goes:

I tried responding to https://issues.guix.gnu.org/70211, by sending an e-mail to 
the 70211@debbugs.gnu.org 
<mailto:70211@debbugs.gnu.org?subject=emacs-eglot%20fails%20after%20upgrade%20to%20emacs-29.3> 
address, as is stated on that page. However, whenever I send a reply to a 
debbugs address (this also happened in the past), I get a message back, that my 
e-mail was not delivered and something about TLS.

Here is what I think might be the reason and I am asking you, whether I 
understand the issue correctly:

I am guessing that debbugs does not support TLS and that I have somewhere 
configured to always send via TLS and then posteo tells me, that the target mail 
server does not support it.

Correct?

Or is it the Posteo server that demands TLS and debbugs does not offer it?

Perhaps others have this issue as well and are unable to participate?

Best regards,
Zelphir


-------- Forwarded Message --------
Subject: 	Undelivered Mail Returned to Sender
Date: 	Tue, 19 Nov 2024 02:16:01 +0100 (CET)
From: 	Mail Delivery System <MAILER-DAEMON@mout01.posteo.de>
To: 	zelphirkaltstahl@posteo.de



This is the mail system at host mout01.posteo.de.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<70211@debbugs.gnu.org>: TLS is required, but was not offered by host
debbugs.gnu.org[209.51.188.43]

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