How to Know When Unsubscribing Isn't Safe: "What if unsubscribing from an e-mail newsletter actually prompted the publisher to sell your e-mail address to spammers? This article describes an easy, free way to know in advance whether it's safe to unsubscribe from an e-mail list. It also reveals secrets of some innocent-looking unsubscribe forms that are not safe to use."
(Via digg.)
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