Did you ever wish you could quickly retract an email right after you sent it?

First, turn on Undo Send

1. On your computer, open Gmail.
2. In the top right, click Settings   Settings.
3. In the "Undo Send" section, check the box next to "Enable Undo Send."
4. In the "Send cancellation period" section, set the amount of time you want to decide if you want to unsend an email.
5. At the bottom of the page, click Save Changes.

Undo sending your message

After you turn on Undo Send, you can cancel sending an email.

1. After you send a message, you'll see the message "Your message has been sent" and the option to Undo or View message.
2. Click Undo.

If you use Outlook you can also unsend right after you send an email by following the instructions found here.