nostr:npub1ccc7agl0tc6mq32ne8dqp6usq7jzy06mfzlhzpxs0zf808q49h6qucsp5w and particular thanks for making it clear discourse (Ansible forum) has a mailing-list mode; I glanced for it, but didn't immediately see it.

I've now enabled it and will use your Mutt recipe!