New blog post: Painless multi-account emailing with imaps and smtp in gnus in #emacs
The "painless" is of course a bit of a joke; I hope by sharing how I made it work other people are spared a few hours of config-fiddling. Once you know how it works, it is actually somewhat simple.
https://leon_plickat.srht.site/writing/painless-mail-imaps-smtp-gnus-emacs/article.html