Hardly a day goes by that I don’t find some valuable message falsely identified as SPAM by our corporate spam filter. I’ll be anxiously waiting for for example, an important document to complete a transaction, and then find that the spam filter snagged it hours before. Very Frustrating! It’s worse than getting unwanted spam messages in the inbox. When you’re considering an antispam product or service for yourself, this is a valuable lesson: While your choice should block as much spam as possible, it’s critical that an antispam product keep false positives (good mail marked as spam) to a bare minimum. And, of course, it should do both without slowing or interfering with your usual e-mail habits.
There are three main approaches to filtering out spam. Content-filtering products use their own proprietary algorithms to distinguish spam from valid mail. Challenge/response products block all mail from addresses other than trusted ones but allow new correspondents who respond to an e-mailed challenge. And community-based products use the collective intelligence of their users to decide what is and isn’t spam. Each approach has its own plusses and minuses.
Read the full article over at PC Magazine
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