google launched a new feature?

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Google has launched a new application that is undo mail....Have u ever feeled that the mail u had send shud not have been send to that person....Ya this might have come with u some day...so now the new feature will help u out in undoing the mail u have send.....this will be a great thing for all people since mailing once send in yahoo,in,hotmail,indiatimes,etc cant be retrieved to not to be send but this feature has been included by google....SO COmment guys