With just one unintended click in the e-mail system's address book, the message for that one person could be sent to an entire organization. People should confirm the contents of their e-mail before sending it. This is because an e-mail could have a long life. It can usually be retrieved from a variety of locations such as networks, local hard drives and backup. People shouldn't assume that when they delete their message that it has been deleted from the system.
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