Here's How To Undo A Sent Email In Gmail

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 30-second window to "undo" sending an outgoing email.
You just have to enable it first.
Here's how it works:

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