You can add any email address you like to your Paypal account as long as it is not in use by someone else within Paypal. That seems to be the only check that is made. The email can be an address that does not belong to you - you can add the president of the United States email to your account, provided he does not have a Paypal account attached to that email, or indeed the Pope. You can add a ficticious, temporary or disposable email. The email will not be "confirmed" (unless that person eg the president confirms it) but causes significant problems. For example - the rightful owner of that email will not now be able to use that email in their Paypal account. So you can block the President, for example, or anyone from opening an account. If by chance the president were to confirm that email then I could siphon off any payments paid to his email. This could be prevented by Paypal only allowing you to add additional email addresses to your account by interactive confirmation when you attempt to add them to your account.