> Even worse, if I want to reply to an issue on a mailing list that I'm not > subscribed to, it's difficult. I still haven't figured it out, maybe you can > go > to the archive and download an mbox and look at the reference and ask your > mail > client to reply to it? I don't know.
You read the (X-)"Message-Id" header field from the archive (for Guix, it's in a HTML comment - for example in <http://lists.gnu.org/archive/html/guix-devel/2016-07/msg01127.html>). Then you add an "In-Reply-To" header with the same value to your E-Mail (if your E-Mail client doesn't add angle brackets, add them manually - but for example git send-email adds angle brackets automatically). I'd suggest to make this field a text in the archive instead of a comment. Is that possible?
