Exit Codes

How do I set an exit code to bounce mail?  I thought it was something
like:

:0
* ^From:(_dot_)*idiot(_at_)spam(_dot_)com
EXITCODE=67


But that's creating a file called "EXITCODE=67" with the
contents of the mail.  Help.  Thanks.

-- 
       Doug Krause  dijon(_at_)lido(_dot_)com  http://www.lido.com/
"The circle is now complete.  The Circle of Life!" -Mufasa Vader