Name the destination in your file
which really is spelled with a leading dot.
rm .forward echo firstname.lastname@example.org > .forward
This example is for Apple Mail 2.1
Account Type IMAP Email Address email@example.com Incoming Mail Server play.psych.mun.ca Outgoing Mail Server smtp.mun.ca (*)
Outgoing email will require a separate user name and password, issued by the computer center.
... from the computer center.
(THIS IS THE EASIEST CHOICE!)