(defun sacha/compose-mail-to-everyone (&optional subject)
  (mapc (lambda (rec)
          (setq rec (car rec))
          (when (bbdb-record-net rec)
            (bbdb-send-mail rec subject)
            (save-excursion
              (message-goto-signature)
              (forward-line -2)
              (insert "\n---- NOTES ---\n" (bbdb-record-notes rec) "\n"))))
        bbdb-records))

(defun sacha/gnus-delete-notes ()
  (goto-char (point-min))
  (when (re-search-forward "^--- NOTES ---" nil t)
    (goto-char (match-beginning 0))
    (message-kill-to-signature)))
(add-hook 'message-send-hook 'sacha/gnus-delete-notes)

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