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Gmail does not literally unsend SMTP messages. To give you time to undo, Gmail delays sending the message for a few seconds. So if you don't select "Undo" within the time limit, your message will be sent.

How to use: https://support.google.com/mail/answer/1284885?hl=en




Note these instructions are for how to enable this on Gmail, the original. Inbox does this by default.




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