Posted By:
effeYou can set your account to block payments from buyers with unconfirmed addresses. Go to the profile tab on your account summary, then payment receiving preferences.
I had a guy who got naru'd soon after he had won one of my auctions and sent payment from an address that Paypal indicated was unconfirmed. After speaking with a Paypal rep, I refused the payment as I didn't need the hassle of constantly having to monitor my account for chargebacks