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Sometimes you realize you had sent the mail to the wrong person or you have missed to attach a file. Turn on Undo Send in Gmail Labs under Settings, and you’ll see a new “Undo” link on every sent mail confirmation. Click “Undo,” and Gmail will grab the message before it’s sent and take you right back to compose.
This feature can’t pull back an email that’s already gone; it just holds your message for five seconds so you have a chance to hit the Undo button.
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