Hey this feature is available in the GMAIL.Sometimes you hit the send button accidently ohhh 😦 and mail was send to the user, But you don’t want to send this mail. Then what can we do. Don’t take tension buddy GMAIL (my best mail client) provide the facility to undo this mail. 🙂 I will show you how can you use this facility. Follow the following step.This will help you for few second’s
Login into the Gmail Account 🙂
Click on the “Mail Setting” from right upper corner of the window.
then as shown in following image do the all three step and at final step click on enable button