how to feed an automated msg back to person ?

i am trying to set my procmail up so that when a certen subject comes in 
procmail will grab it send it to a script that will genarate text for it then 
mail it back to the user,  any advice right now i have *^subject:.catchphrase
|/script |/sendmail -oi -t 

any advice whould be great 

thanks jamie 
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