emacs.d/bundle/bundle--email.el

(use-package mu4e
  :ensure nil
  :custom
  (mu4e-change-filenames-when-moving t)
  (mu4e-drafts-folder "/Drafts")
  (mu4e-get-mail-command "mbsync -a")
  (mu4e-headers-date-format "%Y-%m-%d %H:%M")
  (mu4e-refile-folder "/Archive")
  (mu4e-sent-folder "/Sent")
  (mu4e-trash-folder "/Trash")
  (mu4e-split-view 'horizontal)
  (mu4e-compose-signature "Cheers Marcus (Nuremberg . Germany)\nGnuPG Key: https://meta.sr.ht/~marcuskammer.pgp\nFingerprint: 86DB 0F30 F9F1 661A 54E2 1664 C374 817B E285 268F")
  (mu4e-update-interval (* 10 60)))

(use-package gnus
  :ensure nil
  :config
  (add-to-list 'gnus-secondary-select-methods
               '(nnimap "mailbox"
                        (nnimap-address "imap.mailbox.org")
                        (nnimap-server-port 143)
                        (nnimap-stream starttls))))

(use-package smtpmail
  :ensure nil
  :custom
  (message-send-mail-function 'smtpmail-send-it)
  (smtpmail-smtp-server "smtp.mailbox.org")
  (smtpmail-smtp-service 465)
  (smtpmail-stream-type 'tls)
  (message-send-mail-function 'smtpmail-send-it)
  (smtpmail-auth-credentials (expand-file-name "~/.authinfo.gpg")))

;; (setq mml-secure-openpgp-signers '("86DB0F30F9F1661A54E21664C374817BE285268F"))
;; (add-hook 'message-send-hook 'mml-secure-message-sign-pgpmime)

(defun me/sign-email ()
  ;; Sign an Email using the key of the sender.
  (interactive)
  (setq mml-secure-openpgp-sign-with-sender t)
  (mml-secure-message-sign-pgpmime))