Here's another creative approach to spamming blocking.  The idea is the 
mail server does a fuzzy checksum of a message as it arrives to 
determine a unique ID for a message.  This checksum is then checked 
against a server that is similarly gathering checksum information from 
other mail servers.  If that checksum is found above a threshold, then 
it's determined to be spam.  Supposedly it's surprisingly effective.

<http://www.rhyolite.com/anti-spam/dcc/>

Serge Knystautas
Loki Technologies
http://www.lokitech.com/


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