There's nothing quite like the dread of spotting a huge typo in a mass e-mail 2 seconds after hitting the "send" button. Now Google's Gmail service will give rueful users the option to take it all back -- but only if they act quickly. Gmail has a feature that allows any message to be recalled within 5 seconds of sending. It also has an option that halts messages that mention an attached file -- but don't contain an attachment.
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