Undo Send (Gmail)

1. Log into Gmail, and click the Gear icon (⚙) on the upper-right and select Settings.
2. Under the General tab , scroll down to Undo Send.
3. Click the drop-down menu and select whether you want the Undo Send option to appear for 5, 10, 20, or 30 seconds after you hit send.
4. Scroll to the bottom and click Save Changes.

When you send an email, an Undo button will appear on the bottom left. Click Undo , and the email will return as a draft for you to continue editing.