Sometimes, you have thought of getting your email back after sending it. The Gmail's "Undo Send" feature comes handy in this situation.Undo Send allows you to withdraw a send email. This option delays sending process of an email and it sends the email to the recipient after the "Send cancellation period" expires.Keep in mind that the "Send cancellation period" is the amount of time you have to unsend an email.By default, Undo Send is enabled (in new Gmail interface) and the default "Send cancellation period" is 5 seconds. If you want to change the "Send cancellation period," then here are the
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