This was possible using procmail so I made a .procmailrc file looking like something like this:
If an email is not from a domain in the list a messege is sent to the sender. Copies of the last 32 rejected messages are saved in a folder for rejected messages. The names in the example file are made up. If you wish to use this procmailrc file change the car company names and the email address and URL found in the example.
If procmail does not run on your system put something like this in .forward:
See the man pages for procmail for more details. Of course your system must be a UNIX system for this to work if it is NT or something get a real computer.