nixos/home/emacs/modules/custom-email-config.el

(setq mail-user-agent 'notmuch-user-agent
      sendmail-program (executable-find "msmtp")
      send-mail-function #'smtpmail-send-it
      message-sendmail-f-is-evil t
      message-sendmail-extra-arguments '("--read-envelope-from")
      message-send-mail-function #'message-send-mail-with-sendmail
      message-kill-buffer-on-exit t
      notmuch-search-oldest-first nil
      notmuch-show-logo nil
      notmuch-hello-thousands-separator ","
      notmuch-archive-tags '("+archive" "-inbox")
      notmuch-message-headers-visible nil
      notmuch-multipart/alternative-discouraged '("text/plain" "multipart/related")
      notmuch-show-all-multipart/alternative-parts nil
      notmuch-hello-sections '(notmuch-hello-insert-header
			       notmuch-hello-insert-saved-searches
			       notmuch-hello-insert-inbox
			       notmuch-hello-insert-alltags)
      notmuch-fcc-dirs '((".*@xenia.me.uk" . "Proton/Sent")
                         (".*@proton.me" . "Proton/Sent")
                         (".*@litherlandsmith.slmail.me" . "Proton/Sent")
                         (".*@icloud.com" . "iCloud/Sent")
                         (".*@ukaea.uk" . "Outlook/Sent")
                         (".*@jet.uk" . "Outlook/Sent"))
      notmuch-saved-searches '((:name "inbox" :query "tag:inbox" :key "i")
			       (:name "unread" :query "tag:unread AND tag:inbox" :key "u")
			       (:name "flagged" :query "tag:flagged" :key "f")
			       (:name "sent" :query "tag:sent" :key "t")
			       (:name "drafts" :query "tag:draft" :key "d")
			       (:name "all mail" :query "*" :key "a"))
      notmuch-tagging-keys '(("a" notmuch-archive-tags "Archive")
			     ("u" notmuch-show-mark-read-tags "Mark read")
			     ("f" ("+flagged") "Flag")
			     ("s" ("+spam" "-inbox") "Mark as spam")
			     ("d" ("+deleted" "-inbox" "-unread") "Delete"))
      notmuch-indicator-args '((:terms "tag:unread AND tag:inbox" :label "󰮒 "))
      notmuch-indicator-force-refresh-commands '(notmuch-refresh-this-buffer
                                                 notmuch-refresh-all-buffers
                                                 notmuch-poll-and-refresh-this-buffer))

(when (require 'notmuch nil :noerror)
  (require 'notmuch-indicator)
  (notmuch-indicator-mode +1)
  (when (require 'hydra nil :noerror)
    (defhydra email (global-map "C-c m")
      "email"
      ("m" notmuch)
      ("c" notmuch-mua-new-mail)
      ("s" notmuch-search)
      ("i" (notmuch-search "is:inbox"))
      ("u" (notmuch-search "is:unread AND is:inbox")))))

(provide 'custom-email-config)