How to Undo any sent mail in Gmail account.

Sometimes, After sending a Email we relies that the Email should not be sent and we want to undo that Email sending. To encounter this problem Gmail has introduced a new feature called "Undo send". If you enable this feature in your Gmail account you can set a buffer time for which every Email is kept in the draft. Within that buffer period you can undo sending of Email.For enabling this feature the following steps are given:-

   Sign in to your Gmail account .

   Click on the setting>Labs

   Enable "Undo send" option.

   Click save changes option

   Now go to the General Tab under the setting and set the cancellation period to undo any Email sending. For this time period, the Email will be stored in the draft and after this time period the Email will be automatically sent if you don't undo that sending.

Now every time when you send a Email you will see the message like this "Your message has been sent. Undo "