Regexp matching the signature separator. It is `^-- *$' by default.

String used to separate the headers from the body. It is `--text follows this line--' by default.

Directory used by many mailey things. The default is `~/Mail/'.

Hook run when initializing the message buffer. It is run after the headers have been inserted but before the signature has been inserted.

Hook run as the last thing when the message buffer has been initialized, but before yanked text is inserted.

Hook called narrowed to the headers after initializing the headers.

For instance, if you're running Gnus and wish to insert a `Mail-Copies-To' header in all your news articles and all messages you send to mailing lists, you could do something like the following:

(defun my-message-header-setup-hook ()
  (let ((group (or gnus-newsgroup-name "")))
    (when (or (message-fetch-field "newsgroups")
              (gnus-group-find-parameter group 'to-address)
              (gnus-group-find-parameter group 'to-list))
      (insert "Mail-Copies-To: never\n"))))

(add-hook 'message-header-setup-hook
          'my-message-header-setup-hook)

Hook run before sending messages.

If you want to add certain headers before sending, you can use the message-add-header function in this hook. For instance:

(add-hook 'message-send-hook 'my-message-add-content)
(defun my-message-add-content ()
  (message-add-header
   "Mime-Version: 1.0"
   "Content-Type: text/plain"
   "Content-Transfer-Encoding: 7bit"))

This function won't add the header if the header is already present.

Hook run before sending mail messages.

Hook run before sending news messages.

Hook run after sending messages.

Syntax table used in message mode buffers.

Alist of ways to send outgoing messages. Each element has the form

(TYPE PREDICATE FUNCTION)

((news message-news-p message-send-via-news)
 (mail message-mail-p message-send-via-mail))