On Tue, 2021-09-28 at 15:49 -0700, Guy Sotomayor via cctalk wrote:
Since EMACS has a full programming language (elisp),
you can write
anything you want in it (mail readers, browsers, calendar apps, other
editors, etc)
Years ago, one of my colleagues showed me a pocket reference card
jesting about "hello world."
At the end of the description of "GNU hello" was a remark "and like any
self-respecting program, it has a built-in mail reader."