Feature Request: Set Reply-To Address when starting thread from lists.a.o

It would be useful to be able to set the reply-to header to users@project when sending things like release announcements or CVE announcement to announce@a.o

Start by locating the entry point that starts threads from lists.a.o and the code that builds outgoing announcement messages. Check how release and CVE announcements are distinguished, then define completion as setting Reply-To to users@project for the requested messages without changing other headers.

Written by the indexing model from the issue text.