Consumers love the "This Is Spam" button popping up on many service providers' e-mail services. Unfortunately, many legitimate businesses are being thwarted, too.

Dumb luck can stuff your company into the spam can, but so can a lack of due diligence. "When a legitimate company is accused of spamming something, a lot of the time they've done something stupid," says Richi Jennings, lead analyst for the e-mail security practice at Ferris Research.

Forbes Magazine publishes a list of seven of those "stupid" missteps. Avoid them: Your company's message depends on it.

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