I work for the Postal Service, so I can relate.   Lots of people that have the same problem, and lots of their mail gets addressed wrong.   The clerks and Postmaster is pretty good about correcting the address and sending it on with a little sticker attached asking to notify the sender of the correct address.   If it's a billing statement and it keeps showing up wrong month after month, it gets returned to the sender.   They wise up in hurry when it costs them another stamp.