Do you ever wish that there was an undo button for email? Gmail has offered this experimental feature for some time now. Six years, in fact. But today it’s officially a regular part of Gmail. 
 
 No more accidentally sending that killer turkey burger recipe to your boss when it was intended for your aunt. How embarrassing! Was your strongly worded email to the neighborhood association about Mr. Vanlandingham’s obnoxious mailbox colors a bit too strongly worded? Just click undo and delete all those what the fudges and holy shoots. Problem solved! 
 
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 So how do you enable Gmail’s undo feature? Go to the little cog icon in the upper righthand corner and select “Settings.” About a third of the way down the page you’ll see the “Undo Send” section. You can choose between 5, 10, 20 and 30 second windows of unsendability. Make sure you hit “Save Changes” at the bottom and you’re all set. 
 
 Then, the next time you hit send on an email that you probably shouldn’t have, you’ve got precisely that many seconds to change your mind and hit the undo button at the top of the page. Decide after 31 seconds that maybe you shouldn’t call your sister’s new boyfriend a dull, shit-breathing knobhead for spilling his entire Zima over your head at last weekend’s barbecue? Well, you’re out of luck in that case, friend. Technology can’t solve all your problems. 
 
 Image by Cairo under Creative Commons license. 

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 Who hasn't hit "Send" and then noticed an egregious typo? Gmail feels your pain and has finally added an "Undo Send" option. 
 
 The ability already existed in Gmail Labs (where users can test new features) since 2009 and Google's Inbox app. But now it's coming to plain ol' Gmail for the Web. 
 
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 Here is how to set it up. Once in Gmail, click on the "General" tab on the top right of the screen — the one that looks like a little gear. 
 
 Choose "Settings," scroll down, click "Enable Undo Send," and choose a cancellation period of between five to 30 seconds. That is how much time users have to hit "Cancel" above an email while it's sending. 
 
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 Once pressed, users will get a chance to edit or delete their email. And that's it! Drunk, angry, sleepy, and just plain careless Gmail users now get a second chance.
– Anyone who's sent an email and immediately started shouting "No, no, no" at the computer might appreciate this new Gmail feature: Users can now call back an email within 30 seconds before it travels on its way, reports NBC News. The "undo send" feature is now available, though users will have to enable it under the settings menu. (The menu is under the cog icon in the upper right of the screen.) There, they can choose a window ranging from five to 30 seconds within which they can undo their reply-all gaffe or whatever. The feature has been in the experimental phase for six years, notes Gizmodo, which has some prudent advice: "Turn it on right now."