The Geeks at Gmail labs have been working hard to make Gmail even better and they come out with innovative hacks to Gmail system every now and then, this time it is a very cool feature , specially for guys like me who are always in a hurry to do things on the web. So next time if you accidentally did send an email that you did not wanted to, then thanks to Gmail Labs feature you have about 5sec. to undo it after you have hit the send button.

You can activate this cool feature from your Gmail account under Settings > Labs. Actually you have about 2-3 seconds while you press the send button and it shows sending mail and then another 5 sec. to undo the previous send operation.

This feature would surely bring some respite for most of the Gmail users and I believe you should definitely use it.