I regret to inform you that gmail has provided this feature of recalling a message. with a very short period of time.
It is useful in the case when a user send out an email and immediately click "Undo send " button.
However, it is not useful for the emails sent for longer period of time.
Had it been sent using outlook(exchange account) to the other person using outlook(exchange account), it could have been recalled.
If you do not want the user to read this sent email, there is a work around.
Please send numerous emails(with same subject) to the same person, with any message in the body section of the email.
When he/she will check emails, he will find these blank emails. He will probably check first 2-3 emails and later delete all of them.
So, it reduces the chance of being this email read.
Please be infomed that we are Justanswer, independent tech support service provider. We are not associated with Gmail team in any way.This is the only way to fix the issue. I have tried my best to provide you with best possible information.
Please do not blame me for gmail Account issue by leaving negative feedback.
Keep me posted.