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That might be... 70-80% effective... But you'd constantly be playing catchup. There's more ways to get added to databases than posting your email address on a website. Unless you are actively scanning for directory harvest attacks, the spammers will be a couple steps ahead.
What you want is to combine a few proven techniques such as bayes analysis/keywords/dcc/honeypots/etc, if you really want to keep spam away.
If you're interested I can point you at a company that does gateway virus scanning right, with a 99.9% spam stopping guarantee, with no false positives.
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