Numerous products and services are now available to shield consumers and businesses from the ever-increasing barrage of spam. But experts warn that no service can possibly keep out all the junk and say that if users are not careful, they could end up blocking some mail that they actually might want.

"What's spam to you could be useful company information to someone else," Gartner research director Maurene Caplan Grey told the E-Commerce Times.

Nevertheless, she noted, e-mail users are being inundated with 10 times the spam they were receiving just a year ago, and 16 times what they were getting two years ago.

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