[mail] Fix how notmuch and mbsync work

emacs/.config/doom/config.el

@@ -644,3 +644,10 @@ Always open the result in `eww`."
                       (insert (or body ""))
                       (insert "\n\n")))
                   (pop-to-buffer buf))))))))))
+(setq send-mail-function 'sendmail-send-it
+      sendmail-program "/usr/bin/msmtp"
+      mail-specify-envelope-from t
+      message-sendmail-f-is-evil t
+      message-sendmail-envelope-from 'header
+      message-sendmail-extra-arguments '("--read-envelope-from")
+      mail-envelope-from 'header)

emacs/.config/doom/config.org

@@ -346,7 +346,7 @@ We'll use `msmtp` to send our email. Again, make sure this is installed.
 #+BEGIN_SRC emacs-lisp
 ;; sendmail-program "/usr/local/bin/msmtpq" <--- this doesn't work as advertised right now
 (setq send-mail-function 'sendmail-send-it
-      sendmail-program "/usr/local/bin/msmtp"
+      sendmail-program "/usr/bin/msmtp"
       mail-specify-envelope-from t
       message-sendmail-f-is-evil t
       message-sendmail-envelope-from 'header