How To Stop a Sent Email in Gmail

Gmail is the most Popular and top ranked Online Email Messaging Service Provider for free. They gives us many features for various purposes .But Does not allow us to stop a sent email. So, I have found out a way to stop a sent Email. Just follow the below tutorial, 


Howto?

1.  First, Log in to your Gmail account,

2.  Now, click on Setting > Labs ,

3.  Now, find out Undo Send, then Enableit it . see the below picture,                   
                      

     

4. Now, Every time , when you send an email to someone , then an UNDO  option will appear to cancel the email.done