As of today Googlehave enabled new feature for your inbox – Undo Send. I am sure everyone is happy as this was missing as a basic functionality in Google Appsand in case you changed your mind about sent email — you could not recall it as you would in Outlook on Exchange server.
If you already had the option switched on in Labs, then it will still be switched on by default. If you didn’t, you’ll need to tick the little box next to “Enable Undo Send.”
Undo Send gives you a set period of time after dispatching an email to change your mind — so once you’ve clicked “Send” you’ll see an option to reverse it on your screen for between 5 and 30 seconds.