paypal email address change question

The qustion may be a newbie question:

I just bought a site with a domain (b.com). However the former owner is still using a@b.com email address as one of his paypal emails because that email address has already been verified by him.

The former owner did not tell me how many subscribers on that site. However, The thing is someone has sent money to him via a@b.com these days and the emails have been forwarded to me because I own the domain.

What should I do next? Do I need to add a new paypal email address (a@b.com) in my Paypal account? Is it possible?

Thanks!

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