procmailrc question

I'm trying to clean up my spam filtering but I'm not exactly sure how to
do it.  Right now I'm mostly adding rules to search the body ofa message
for the advertisers name or phone number, that way regardless of the
email address the ad is sent from I only see each ad once.


:0
* B ?? S1618
spam

:0
* B ?? s.1618
spam

:0
* B ?? CustomOffers.com
spam

:0
* B ?? SUPPLEMENT BUSINESS
spam


etc....

I'd like to be able to put all the filter lines in a seperate file and
have a rule that reas through the file.  That way I only have one line
per entry inhstead of 3.


I'm doing something similar to this for filtering out senders. but I'm
not sure how to expand this to what I want.

# Test if the email's sender is in the blacklisted
:0
* ? formail -x"From" -x"From:" -x"Sender:" \
    -x"Reply-To:" -x"Return-Path:" -x"To:" \
     | egrep -is -f black.lst
spam


I'm hoping someone has an example they could point me at.

thanks,
Bill
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