I implemented a rule that looks for multiple breaks for just that reason.  
Can't remember where I "stole" it from - probably some folks here helped me 
with it a few years ago.  Can't remember who, but appreciated the assistance.

##########################################################################
# - Find messages with eight or more html break characters in it.
##########################################################################
rawbody   CBJ_GiveMeABreak      /(?:<br\/?>[\s\r\n]{0,4}){8}/mi
describe  CBJ_GiveMeABreak      Messages with consecutive break characters
score     CBJ_GiveMeABreak      2.0


 ...Kevin
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Kevin Miller
Network/email Administrator, CBJ MIS Dept.
155 South Seward Street
Juneau, Alaska 99801
Phone: (907) 586-0242, Fax: (907) 586-4500
Registered Linux User No: 307357

-----Original Message-----
From: James B. Byrne [mailto:byrn...@harte-lyne.ca] 
Sent: Wednesday, May 14, 2014 1:08 PM
To: users@spamassassin.apache.org
Subject: Bayes refinement

Is there any way to limit Bayes content checking to only the first X characters 
of the message body?  I ask this because it is clear that the spam messages 
getting through contain text meant to poison the tests but this gibberish 
always trails the main message and is separated by a large white space in most 
cases.


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