136: How do I save a copy of outgoing mail?

  You can either mail yourself a copy by including a "BCC:" header in the
  mail message, or store a copy of the message directly to a file by
  including an "FCC:" header.

  If you use standard mail, you can automatically create a "BCC:" to
  yourself by putting

    (setq mail-self-blind t)

  in your .emacs file.  You can automatically include an "FCC:" field by
  putting something like the following in your .emacs file:

    (setq mail-archive-file-name (expand-file-name "~/outgoing"))

  The output file will be in Unix mail format, which can be read directly
  by VM, but not always by Rmail.  See question 138.

  If you use mh-e add an FCC: or BCC: field to your components file.

  It does not work to put "set record filename" in the .mailrc file.