You clicked send. Oh crap.
When you send a no-take-backs email—maybe an admission to a secret crush, or accidental reply-all—there's an instant pang of regret. It feels like there's no going back.
Meet Gmail's Undo Send feature, a lifesaving little hack buried in the Gmail Labs settings. It gives you a 10-second window to "undo" sending an outgoing email. You just have to enable it first.
Here's how it works:
1. Click the gear icon in the top right corner of your Gmail window and select Settings from the dropdown menu.
2. Select Labs from the row of tabs.
3. Scroll all the way to the bottom where you see Undo Send and click Enable.
4. Hit Save Changes at the bottom.
5. Breathe easy.
Now when you send an email, the yellow dialogue that displays "Your message has been sent" will also give you the option to Undo. Our tests consistently showed that you have about 10 seconds before the Undo option disappears. Click it, and the email will reopen, un-sent, in the composition window.
[UPDATE, Dec. 5, 2013: It defaults so that you have 10 seconds to click before the Undo button disappears, but you can adjust that window of opportunity. Go to Settings > General > Undo Send, and select a cancellation period up to 30 seconds.]
We weren't the first to discover this cool trick, but Gmail's interface has changed since Mashable's tutorial was published in 2010, so we updated the steps. Note that features in Gmail Labs are experimental and may change, break, or disappear at any time. You've been warned.
See also: Gmail's Top Nine Hidden Features
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