If the mail has been already got into recipients inbox then there is no way to delete it. But you can undo or call back an email in Gmail immediately after sending it. Steps to delete an email in Gmail First, you have to enable the undo option Go to Gmail and login Get into settings by clicking on the Gear icon on the top-right position In settings, the default tab is General Tab. Scroll down Find an 'Undo Send' option and Enable it. Set the expiry time there to the maximum. It's 30 seconds To undo a sent email: Find a notice appear immediately after sending a Gmail. There will be an undo button shown on the popup which can be seen at the lower bottom of the screen. Click on the undo button to delete or call back your already sent email. Remember, you have only 30 seconds to react. You can see the blue color undo button in the image.