Re: Discourse emails not recognized as coming from a mailing-list

I also receive Discourse forum posts via email.

I don't make use of mutt's list stuff myself, so this advice may need 
some adaption. Personally, I reply to all messages with "g"
(group-reply) and inspect the to/cc headers presented for correctness.

Note that Discourse messages have a "Reply-To:" header. This contains 
the email address which appends your reply to the correct message thread 
on the Discourse forum.

Have you tried an ordinary "nonlist" reply to such a message? Does it do 
what you need already?

For me it composes a new message to that address. Here's an example when 
I reply to a Python Discourse message:

     From: Cameron Simpson <[email protected]>
     To: "Discussions on Python.org" <incoming+83cadca6a412e454928b5a11601f2603@python1.discoursemail.com>
     Cc:
     Bcc: [email protected]
     Subject: Re: [Py] [Ideas] Abstract Base Class for `queue.Queue` and `multiprocessing.Queue`
     Reply-To:
     In-Reply-To: <discourse/post/[email protected]>

So doing a nonlist reply might "just work" for you.

Cheers,
Cameron Simpson <[email protected]>