article on blocking by subnets

[Barry Gould]

This:
http://www.fadden.com/techmisc/asian-spam.htm

makes me wonder if perhaps Class A or Class B or Class C subnets should be 
tokenized by bogofilter and stored;
e.g., instead of just storing the IP's found in the headers, convert them 
to subnet addresses too.

That way, subsequent spam from a different IP on the same subnet would get 
penalized. The weight would probably have to be lighter than an exact match 
though.

Barry