Trick to undo or callback a Sent Email from Gmail

Gmail is a free, advertising-supported email service provided by Google, With an initial storage capacity offer of 1 GB per user, Gmail significantly increased the webmail standard for free storage from the 2 to 4 MB its competitors such as Hotmail offered at that time.Individual Gmail messages, including attachments, may be up to 25 MB, which is larger than many other mail services support. Gmail has a search-oriented interface and a "conversation view" similar to an Internet forum. Gmail is noted by web developers for its pioneering use of AJAX. 

So far we seen the advantages of Gmail and I am pretty sure that you all may be using this service regularly, that is for sending Emails or other important doccuments through your Gmail. But what happens when you accidently send an incomplete Email, Its gone !! and you can't retrieve or block it. But it can be done with the help of an application designed by Google Labs just add this to your Gmail account and thats it you will be prompted with an extra option named UNDO as seen below.

WHAT IS GOOGLE LABS 

The Gmail Labs feature, introduced on June 5, 2008, allows users to test new or experimental features of Gmail, such as bookmarking of important email messages, custom keyboard shortcuts and games. Users can enable or disable Labs features selectively and provide feedback about each of them. This allows Gmail engineers to obtain user input about new features to improve them and also to assess their popularity and whether they merit developing into regular Gmail features. All Labs features are experimental and are subject to termination at any time.  

HOW TO SET UP THIS FEATURE IN YOUR GMAIL.

1. Adding this application to your Gmail Account is simple, Just goto Mail settings, You can see a window as shown below.

 

2. Just select the Labs tab to see a number of supported apps, from this select UNDO SEND as shown below.

3. Just enable this feature to activate UNDO SEND and save your changes. Thats it and enjoy..