A little while back I mentioned the new feature in Gmail Labs callled Mail Goggles to prevent you from sending emails while intoxicated by asking you mathematical questions before sending off the email.
Now there’s another new lab feature called Undo. You can now undo that email you mistakenly sent or forgot to attach the attachment to, or sent to the wrong person.
BUT, you’ve only got 5 seconds to do it. It will not recall messages sent but delay the sending of the email for 5 seconds.
Go to your settings page and click on the Labs tab. Then scroll down to the Undo item and select Enable and then save your settings.
Now once you’ve sent your email you’ll see an Undo link next to the “sent” message that will stay there for 5 seconds to allow you to undo the send.
Thanks to Dre for spotting that one and passing it on.