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Microsoft will deploy Brightmail's Solution Suite to filter spam at the incoming SMTP gateway before it is delivered to Hotmail users' inboxes.
The spam guard will be fully deployed later this year to serve Hotmail's 110 million users worldwide.
The Brightmail solution works by taking a collection of more than 200 million e-mail addresses designed to attract spam, allowing Brightmail to identify and eliminate spam before it reaches users' inboxes. San Francisco-based Brightmail claims to have a significant foothold on the anti-spam market, boasting clients such as Earthlink and AT&T WorldNet.