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I recently turned-on the option to undo a sent email (30 seconds), but I can't find a way to execute the undo

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I read an article that informed me that Gmail recently added an option where one can undo the sending of an email up to 30 seconds after the enter key ( to send it) has been hit. I went into settings and turned this feature on and set it for 30 seconds. But I can't find any instructions on how to "undo" an email. How do you use this feature when needed, after it is is turned on?

I read an article that informed me that Gmail recently added an option where one can undo the sending of an email up to 30 seconds after the enter key ( to send it) has been hit. I went into settings and turned this feature on and set it for 30 seconds. But I can't find any instructions on how to "undo" an email. How do you use this feature when needed, after it is is turned on?

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This feature might only apply to messages sent on the webmail platform, and not to dedicated mail clients, particularly considering the tight timing of the 30-second delay.

Article on the setting does not say one way or the other: Undo sending your mail - Gmail Help