Btw, just one clarification, it's confirmed address. A confirmed address is presumably one that your credit card issuer has on file.
People sometimes say verified address, but in Paypal terminology, there is a verified Paypal account (if you have submitted your bank account info to Paypal), which is a different thing, so calling it verified address can sometimes confuse buyers.
When I list stuff, I say that I ship only to confirmed address. However, if they are a buyer with great feedback (or a repeat buyer), I'm willing to make exceptions.