Cloudmark's business model: Authority
http://www.infoworld.com/articles/hn/xml/02/11/18/021118hnspam.xml
Interestingly, their server side filtering solution does not require a
connection to the net. So it's not working exactly the same way Razor
or Spamnet does -> by comparing message signatures to a blacklist.
Instead, I'm guessing that Cloudmark is feeding the results of their
p2p voting system into the learning algorithm, and deploying the
'trained' code to the enterprise for offline usage. Wow.
Here's Cloudmark's press
release
7:30:39 PM 
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