Hello,

I recently switched in-buffer completion from company [1] to
completion-at-point with corfu [2] as the UI.

As I wanted email address completion via completion-at-point in
message-mode too, I implemented a new EUDC function to go into
completion-at-point-functions [3].

[1] https://company-mode.github.io
[2] https://github.com/minad/corfu
[3] https://github.com/emacs-mirror/emacs/blob/master/lisp/net/eudc-capf.el

To close the loop, I also wrote an EUDC back-end to get candidates from
notmuch-address (which attached).

Now, with a eudc-server-hotlist value of

(("localhost" . notmuch-address)
 ("localhost" . macos-contacts))

and eudc-capf-complete among completion-at-point-functions in
message-mode, I get combined email address completion candidates from
both sources offered by completion-at-point when composing a new email.

Life can be a breeze at times... ;-)

I hope anyone else finds this useful.


Hoping to have helped, and looking forward to your thoughts,

  --alexander