[elliottcarlson]

USPS only forwards the mail for one year after notification. After that any mail that is still marked for that address will be delivered there. Ideally you would have notified all relevant parties at that point.

Also a lot of junk mail will be addressed to the name "or current resident"

[DashRattlesnake]

However, the forwarding database is apparently pretty easy to get access to. Junk mailers will query it and update their list with your new address.