GMail users can now "Undo" send Messages
With that mistake, you can correct and fix that problem by using Gmail Labs' new "Undo Send" feature. Enabling the said settings will give you opportunity to reclaim the message.
The only thing is, you will be like a member of a SWAT bomb squad. You can only "Undo" the sent process in five seconds.
[GMail Lab news -GMail Blog ]
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