Open Gmail
Click the gear icon
Select See all settings
Under General, find Undo Send
Set the cancellation period
Scroll down and click Save Changes
After sending an email, click Undo in the bottom-left corner
Act before the undo time expires
Open Gmail
Click the gear icon
Select See all settings
Under General, find Undo Send
Set the cancellation period
Scroll down and click Save Changes
After sending an email, click Undo in the bottom-left corner
Act before the undo time expires