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oh and symantec and McAffee not to found of at all, don't work as well as the others
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oh and symantec and McAffee not to found of at all, don't work as well as the others

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I'm looking for a good spam filtering solution for Exchange Server 2003.<br />
<br />
Anyone have any suggestions? Preferably free, but OK if it's not. 
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I'm looking for a good spam filtering solution for Exchange Server 2003.

Anyone have any suggestions? Preferably free, but OK if it's not. 

Best Spam Filtering Software

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.