Gmail has many interesting features , mostly available in Gmail Labs . Undo send is an interesting feature using which you can just retrieve back the mail message you just sent. You can also set the time interval , before which you may / may not want to retrieve the sent mail message.
To enable this feature, just log on to Gmail , and go to Gmail settings.
– Click on the Labs link, and Enable “Undo Send”
– Navigate to General tab under settings, and set the time , lets say 10 seconds.
– Compose a mail, and click on “Send” now, you will get and “Undo” link along with the confirmation, click on the undo link to retrieve the message back !