- First Login into your Gmail Account
- Go to setting option and find the Labs option
- Then go to Undo Send option and enable it. Then click on Save Changes.
- Then go to compose Mail. And send mail.
- By default, Gmail gives you a 10-second window of time in which you may undo a sent e-mail.
If you want the send mail back then go to undo option . Your sending mail will be back.
