'Undo Send' — How to Unsend Emails in Gmail

Sending an important and confidential email to one of my friends and mistakenly clicked send to someone else. Holy crap! This is something experienced by everyone of us at some point. When we accidentally hit the reply-all button, send an email to the wrong person, or sometimes forget to attach a file, and then left only with an instant pain of regret. It feels like there is no going back.

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