How to unsend an Email from Gmail?

All of us have experienced email regret.

In such a situation wouldn't it be great if it were possible to unsend or undo send an email. This is where the gmail Undo Send feature helps. Once enabled the undo send feature allows you to unsend an email even after it has been sent.

Once you enable the Undo send option, everytime you send an email gmail will not send it instantly.
Instead it will hold back the email on its server for a few seconds allowing you to change your mind, retrieve and modify the email if you wish. To enable undo send feature in gmail all you need to do is:

1. Once you are logged onto your gmail account, click on Settings button.
2. A drop down menu will pop up on the screen again click on settings option.
3. Now click on Labs to browse through all Google Labs feature. Google Labs basically contains experimental feature  that may still be under development.
4. Scroll on the Labs page and look for Undo Send option and enable it.
5. Save the changes.

The Feature is enabled now you can make a try...