I would have difficulty doing that since I don't know what mail transfer agent you have available. If you have sendmail, there's a Sendmail-address-rewriting-HOWTO file you really need to read. I don't know what flavor of Linux you're using but if it's slackware and you chose to install the howto files, you might need to run as root slocate -u and after that command finishes do a locate HOWTO to find the files. Once you get into the directory you can use zless to read any of the HOWTO files that has a .gz extension on its end.
