What's wrong of my script?

PATH=/bin:/usr/bin:/usr/local/bin 
SHELL=/bin/sh 
MAILLIST=user1(_at_)mydomain(_dot_)com|user2(_at_)mydomain(_dot_)com

:0 fhw: 
* !From.${MAILLIST} 
|(formail -r ; echo "Your post rejected!")| $SENDMAIL
-oi -t

Thanks
Chris

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