Hi, The Wanderer wrote: > Rodolfo posted a copy of that message as an attachment, just now, so > that should be check-able. I don't see anything quite odd just at a glance.
Yes. Looks totally normal. > Here's an attempt to reply to the message which Rodolfo Medina has > reported having trouble replying to. Has anyone else tried to reply to > this message, prior to this? I did, creating the sub-thread "Re: test, Was: mplayer won't play m4a". Same as with your attempt: no problems. And Rodolfo can reply to our follow-up mails in the thread. It is not yet proven whether the strange In-Reply-To: header content is to blame. But i see it in my Cc: of the failed attempt of Rodolfo to follow-up to Andrei POPESCU's mail with id 20190826190505.zldub4tzker6am7d@localhost. The successful attempts to our recent mails don't have this header. Rodolfo's mails have User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) So maybe this is a reason to ask b...@gnus.org if it still exists. Or to study http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/gnus where a search for "In-Reply-To" finds http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/gnus?id=fa98585ca3779749f7acadf5eaa321c03f7b0b8e which leads me to http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/gnus/message.el#n5618 (defun message-make-in-reply-to () ... "'s message of \"" (if (or (not date) (string= date "")) ... This is obviously the text snippet that is attached to Rodolfo's In-Reply-To: <20190826190505.zldub4tzker6am7d@localhost> (Andrei POPESCU's message of "Mon, 26 Aug 2019 22:05:05 +0300") But i am too old to learn digesting Lisp poems. (Either you learn it until you are 30 - or never.) So i cannot tell why and when this function is called and a In-Reply-To header gets added. Have a nice day :) Thomas