do you know about google

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i was unaware about one of the functions in gmail but recently i got a mail from my friend who told me that we can undo the mail we send to someone. I mean how many time you have thought that would have been better if you could cancel or undo the mail you are sending..well google has this option in their gmail..to enable to option just go to google settings and then click on LABS, there you will see so many options which you can enable or disable...give it a try...