If you make a typo or regret sending a message, you can undo the action by enabling "Undo send". This setting gives you the option to take back a message you just sent.
To enable Undo Send:
1- Click the gear in the top right .
2- Select Settings.
3- Scroll down to "Undo Send" and click Enable.
4- Set the cancellation period (the amount of time you have to decide if you want to unsend an email).
5- Click Save Changes at the bottom of the page.
If you had Undo Send turned on in Gmail Labs, your Undo Send setting will be on by default.
Note: To give you time to undo, Gmail delays sending the message for a few seconds. So if you don't select "Undo" within the time limit, your message will be sent. "Undo send" may not work if you experience connection issues.
https://support.google.com/mail/answer/1284885?hl=en
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