Sterling McBride spends a lot of time waiting for spammers to make a mistake. They usually do.
When he hunted down escaped prisoners for the United States Marshals Service, Mr. McBride learned the value of lying low until fugitives trip up, leaving small clues on their whereabouts. Now, as an investigator for Microsoft, Mr. McBride watches carefully for tidbits of data that link some of the two billion pieces of junk e-mail that Microsoft's Hotmail service receives each day with the people who send them.
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