And it's a hoax that keeps on giving. Spouting panic-inducing nonsense borrowed from other false virus alerts dating back eight years, the "Postcard" warning has been in circulation since February, bolstered by the erroneous claim that Snopes.com has verified it as true.

A word to the wise: keep your antivirus software up to date and don't click on attachments or links in messages from unfamiliar or otherwise suspicious sources.

But don't believe everything you read in forwarded emails.

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Email tells the story of a vehicle owner in Cartersville, Georgia who says he was cheated by a service station whose gas pumps were rigged to deliver less fuel than what was shown on the display. According to the anonymous message, one in four gas pumps are purposely miscalibrated this way. True or false?