We usually think of spam filtering as a highly automated function that fends off the millions of spam messages trying to force their way into inboxes. Yet even the most sophisticated spam filters have a human component, often a network of e-mail users who click the "this is spam" button in their e-mail interfaces or vote on a message's spamminess through services such as Cloudmark.
Microsoft's Hotmail takes the people factor one step further with a little-known but highly valued panel of humans who tell Microsoft whether they believe an e-mail message is spam or not.
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