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How does Anti-spam software work, and what is the best on the market?

Public Comments

1. Anti-spam software works in 2 main ways - first by checking with online lists of known spam source IPs, and second by scanning the content of the email and weighting everything it sees. As to what's best? Well, that depends on your point of view. There really is nothing that delivers 100% spam filtering with 0% false positives, but with a lot of time and training, many solutions can deliver quite acceptable results.
2. To prevent e-mail spam, both end users and administrators of e-mail systems use various anti-spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users and administrators. No one technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate e-mail vs. not rejecting all spam, 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 the email administrator, those that can be automated by e-mail senders and those employed by researchers and law enforcement officials. and the best is symantec