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Check out Gmail’s newest video on how it fights against spam. Gmail users play an important role in keeping spammy messages out of millions of inboxes. When the Gmail community votes with their clicks to report a particular email as spam, its system quickly learns to start blocking similar messages. The more spam the community marks, the smarter our system becomes.
http://www.google.com/mail/help/fightspam/spamexplained.html
