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you could’t normally “undo” an email sent by mistake.
Their email server receives it and shows it in their email client.
There’s no way to go back and undo an email that’s already sent out.
The copy is on someone else’s mail server, completely out of your control.
Microsoft Outlook does contain a “Recall” feature that allows you to recall email messages in certain cases.
Outlook’s recall featureworks by sending a message to the other person’s inbox.
The message asks their email client to kindly delete the email you just sent.
By default, Outlook will delete the email message if they haven’t read it yet.
However, it’s possible for a user to disable this feature so Outlook will ignore these requests.
Other email clients may have features that can work in a similar way.