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In some company networks with their own mail servers it is possible to recall an email if the email server allows it.
Unfortunately with gmail it is not possible to recall an email after it has been sent. There is no time in transit and when you clicked send the email is already in the other persons inbox nearly instantaneously. Your account no longer has control over that message once it is sent. The only thing I can suggest is to send another email explaining that it was sent in error. I am sorry about that but it is the truth and there is no way to recall the message
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The reason here is as you have already passed your overlook limit which you have set by enabling Undo feature.