If you use Gmail, heave a sigh of relief if you accidentally sent an inappropriate email to your boss, or if you realized the morning email you wrote was full of typos. The service's Undo Send feature has been upgraded to delay the sending of your email of up to half a minute (it used to be a five-second window). All you have to do is go to Gmail Labs and add it on through your Gmail settings. Do you find this feature helpful?
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