By default, a copy of any mail that you send is
kept. To send yourself a copy of any message, add a line to the headers of the message that consists of the text
followed by your e-mail address. This line can be added anywhere before the line that reads "
-----text follows this line-----
If you wish, you can automatically send yourself a copy of
message you send by adding your name to the
field by default.
To do this, set the value of the variable