Have you ever hit send then realized that you need to add additional text or that you had a misspelled word? Then this tip is for you.
1. Start by going to the Setting gear icon to the right of your inbox, then click Settings.
2. Click on Labs.
3. Then search or scroll down to Undo Send and click Enable.
4. Now click on General, scroll down to Undo Send. Now you can now choose how many second you would like to delay sending.
This tip can save you some embarrassment : )