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### 1.3 Reply

The `message-reply` function pops up a message buffer that’s a reply to the message in the current buffer.

Message uses the normal methods to determine where replies are to go (see Responses), but you can change the behavior to suit your needs by fiddling with the `message-reply-to-function` variable.

If you want the replies to go to the `Sender` instead of the `From`, you could do something like this:

    (setq message-reply-to-function
          (lambda ()
           (cond ((equal (mail-fetch-field "from") "somebody")
                   (list (cons 'To (mail-fetch-field "sender"))))
                 (t
                  nil))))

This function will be called narrowed to the head of the article that is being replied to.

As you can see, this function should return a list. In this case, it returns `((To . "Whom"))` if it has an opinion as to what the To header should be. If it does not, it should just return `nil`, and the normal methods for determining the To header will be used.

Each list element should be a cons, where the CAR should be the name of a header (e.g., `Cc`) and the CDR should be the header value (e.g., ‘`larsi@ifi.uio.no`’). All these headers will be inserted into the head of the outgoing mail.