How to Undo the Sent E-mail in Gmail

Enable The Undo option In Gmail

Have you ever worried about the important e-mail sent to the wrong person.
Do you know that we undo the sent e-mail i.e we can retrieve the sent e-mail before he/she reads the e-mail..This option is available in Gmail.
Enabling the Undo Option In Gmail

First Login to your G-mail Account
And then right hit on the wheel button (Settings).

After Hitting on the "Settings" by default "General" Tab opens


Now Switch to the "Lab" Tab

And scroll down to the end os the page and find the "Undo Send"

After finding it you need to "Enable" the option and save it.
thats all.