How do I send output to a program?

i would like to get the HEADER and the MESSAGE from the mail sent to my
program, how would i do this? 

:0
* ^TOguestbook(_at_)mydomain(_dot_)com
* !^FROM_DAEMON
|/usr/www/cgi-bin/php3.cgi -q myscript.php3 $HEADER $MESSAGE



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