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If there is a cancel option then it means that the email address you sent the payment to is non existant.
Either they made a spelling error when they gave you the email address or you did when you entered it to pay for the item.
Could be something as simple as a misplaced dot.
You may as well cancel the payment as its not going anywhere and then check the correct spelling of the email address.
If you are sending a paypal payment via paypal and he doesn't have a paypal account then no of course he won't receive it