Numerous individuals dont know how to undo the sent email in Gmail. Gmail supports the undo wonderful option.
To do this login to gmail and do the following Steps:
Step 1. Go to Setting Panel(Gear icon on right hand side) in Gmail.
Step 2. Take a general tab and can see the undo send option.
Step3. Click on that checkbox and set the time period
Step 4. To check the whether it works or not, send an email to someone. At the moment you can see Undo option in the screen. Click on it and everything return back to the send stage
Video Tutorial of steps to undo the sent email in Gmail