+;; To send pre-formatted letters like the example below, you can use
+;; `message-send-form-letter':
+;; --8<---------------cut here---------------start------------->8---
+;; To: alice@invalid.invalid
+;; Subject: Verification of your contact information
+;; From: Contact verification <admin@foo.invalid>
+;; --text follows this line--
+;; Hi Alice,
+;; please verify that your contact information is still valid:
+;; Alice A, A avenue 11, 1111 A town, Austria
+;; ----------next form letter message follows this line----------
+;; To: bob@invalid.invalid
+;; Subject: Verification of your contact information
+;; From: Contact verification <admin@foo.invalid>
+;; --text follows this line--
+;; Hi Bob,
+;; please verify that your contact information is still valid:
+;; Bob, B street 22, 22222 Be town, Belgium
+;; ----------next form letter message follows this line----------
+;; To: charlie@invalid.invalid
+;; Subject: Verification of your contact information
+;; From: Contact verification <admin@foo.invalid>
+;; --text follows this line--
+;; Hi Charlie,
+;; please verify that your contact information is still valid:
+;; Charlie Chaplin, C plaza 33, 33333 C town, Chile
+;; --8<---------------cut here---------------end--------------->8---
+
+;; FIXME: What is the most common term (circular letter, form letter, serial
+;; letter, standard letter) for such kind of letter? See also
+;; <http://en.wikipedia.org/wiki/Form_letter>
+
+;; FIXME: Maybe extent message-mode's font-lock support to recognize
+;; `message-form-letter-separator', i.e. highlight each message like a single
+;; message.
+
+(defcustom message-form-letter-separator
+ "\n----------next form letter message follows this line----------\n"
+ "Separator for `message-send-form-letter'."
+ ;; :group 'message-form-letter
+ :group 'message-various
+ :version "23.1" ;; No Gnus
+ :type 'string)
+
+(defcustom message-send-form-letter-delay 1
+ "Delay in seconds when sending a message with `message-send-form-letter'.
+Only used when `message-send-form-letter' is called with non-nil
+argument `force'."
+ ;; :group 'message-form-letter
+ :group 'message-various
+ :version "23.1" ;; No Gnus
+ :type 'integer)
+
+(defun message-send-form-letter (&optional force)
+ "Sent all form letter messages from current buffer.
+Unless FORCE, prompt before sending.
+
+The messages are separated by `message-form-letter-separator'.
+Header and body are separated by `mail-header-separator'."
+ (interactive "P")
+ (let ((sent 0) (skipped 0)
+ start end text
+ buff
+ to done)
+ (goto-char (point-min))
+ (while (not done)
+ (setq start (point)
+ end (if (search-forward message-form-letter-separator nil t)
+ (- (point) (length message-form-letter-separator) -1)
+ (setq done t)
+ (point-max)))
+ (setq text
+ (buffer-substring-no-properties start end))
+ (setq buff (generate-new-buffer "*mail - form letter*"))
+ (with-current-buffer buff
+ (insert text)
+ (message-mode)
+ (setq to (message-fetch-field "To"))
+ (switch-to-buffer buff)
+ (when force
+ (sit-for message-send-form-letter-delay))
+ (if (or force
+ (y-or-n-p (format "Send message to `%s'? " to)))
+ (progn
+ (setq sent (1+ sent))
+ (message-send-and-exit))
+ (message (format "Message to `%s' skipped." to))
+ (setq skipped (1+ skipped)))
+ (when (buffer-live-p buff)
+ (kill-buffer buff))))
+ (message "%s message(s) sent, %s skipped." sent skipped)))
+
+(defun message-replace-header (header new-value &optional after force)
+ "Remove HEADER and insert the NEW-VALUE.
+If AFTER, insert after this header. If FORCE, insert new field
+even if NEW-VALUE is empty."
+ ;; Similar to `nnheader-replace-header' but for message buffers.
+ (save-excursion
+ (save-restriction
+ (message-narrow-to-headers)
+ (message-remove-header header))
+ (when (or force (> (length new-value) 0))
+ (if after
+ (message-position-on-field header after)
+ (message-position-on-field header))
+ (insert new-value))))
+
+(defcustom message-recipients-without-full-name
+ (list "ding@gnus.org"
+ "bugs@gnus.org"
+ "emacs-devel@gnu.org"
+ "emacs-pretest-bug@gnu.org"
+ "bug-gnu-emacs@gnu.org")
+ "Mail addresses that have no full name.
+Used in `message-simplify-recipients'."
+ ;; Maybe the addresses could be extracted from
+ ;; `gnus-parameter-to-list-alist'?
+ :type '(choice (const :tag "None" nil)
+ (repeat string))
+ :version "23.1" ;; No Gnus
+ :group 'message-headers)
+
+(defun message-simplify-recipients ()
+ (interactive)
+ (dolist (hdr '("Cc" "To"))
+ (message-replace-header
+ hdr
+ (mapconcat
+ (lambda (addrcomp)
+ (if (and message-recipients-without-full-name
+ (string-match
+ (regexp-opt message-recipients-without-full-name)
+ (cadr addrcomp)))
+ (cadr addrcomp)
+ (if (car addrcomp)
+ (message-make-from (car addrcomp) (cadr addrcomp))
+ (cadr addrcomp))))
+ (when (message-fetch-field hdr)
+ (mail-extract-address-components
+ (message-fetch-field hdr) t))
+ ", "))))
+