How to Undo Sent Mail in Gmail in just 5 Steps

If you accidentally sent an email prematurely before you were ready to send it, there’s a feature in Gmail that you can enable that allows you to undo a sent email within a given period of time. Follow these simple steps to undo an email.

1. Click the gear in the top right.
2. Select Settings.
3. Click the Labs tab and scroll down.
4. Find the “Undo Send” lab and select the Enable radio button.
5. Click Save Changes at the bottom of the page.

Enjoy..............