Bob Newell [2019-10-21T21:26:16-10] wrote:

> If you want the absolute ultimate, it's Gnus.

Yes, Gnus is great. It has the most features. I'll just point out that
Emacs's other mail user agents use partially the same code as Gnus. For
example, Notmuch Emacs uses message-mode (actually its derivative:
notmuch-message-mode) for composing messages and the same
message-sending back-end functions as Gnus. So, many of the same
configuration is available to other Emacs mail user agents. It's the
message fetching and reading part which is different.

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