E-mail, the Internet's first killer app, can injure companies and individuals when not used with care. In its attempt to document the risks of electronic messaging and to make the case for the value of its services, Proofpoint, an e-mail security company, has assembled a list of what it considers are the "Top 10 Terrifying E-mail Blunders of 2009."
Keith Crosley, director of market development at Proofpoint, says the incidents his company has cited demonstrate the ongoing need for user training, for corporate e-mail policies, and for technology to enforce corporate policies. He says that only about a third of enterprises have deployed systems that can identify and block the unauthorized transmission of health or financial data.

The incidents that follow are, according to Proofpoint, in no particular order.

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