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(message)Various Message Variables

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Various Message Variables
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`message-default-charset'
     Symbol naming a MIME charset.  Non-ASCII characters in messages are
     assumed to be encoded using this charset.  The default is `nil',
     which means ask the user.  (This variable is used only on non-MULE
     Emacsen.  Note: Charset Translation,
 for details on the MULE-to-MIME translation process.

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

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

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

`message-signature-setup-hook'
     Hook run when initializing the message buffer.  It is run after the
     headers have been inserted but before the signature has been
     inserted.

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

`message-header-setup-hook'
     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)

`message-send-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 "X-In-No-Sense: Nonsense")
            (message-add-header "X-Whatever: no"))

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

`message-send-mail-hook'
     Hook run before sending mail messages.

`message-send-news-hook'
     Hook run before sending news messages.

`message-sent-hook'
     Hook run after sending messages.

`message-mode-syntax-table'
     Syntax table used in message mode buffers.

`message-send-method-alist'
     Alist of ways to send outgoing messages.  Each element has the form

          (TYPE PREDICATE FUNCTION)

    TYPE
          A symbol that names the method.

    PREDICATE
          A function called without any parameters to determine whether
          the message is a message of type TYPE.

    FUNCTION
          A function to be called if PREDICATE returns non-`nil'.
          FUNCTION is called with one parameter - the prefix.

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