Would you be willing to answer a few brief questions about PlayStation Forums?
Is there a way to create a new playstation online ID without changing my email?
You can change the email of the current account and then create a new account with your own email, but you'll still need an extra email account to do that.
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Each PSN account has to use a different e-mail address. If you have two PSN accounts, then you have to have two e-mail addresses. You can't use the same one with both.