I have always been in admiration for the USPS; they handle gadzillions of pieces per day, and manage to get most of them delivered. When I write a letter, it seems to get delivered even though my handwriting got my teachers to send for my parents to 'have a talk about Allan's penmanship'. (many years ago)
However:
I have tried to use the post office to deliver post cards. I paid normal price for each delivery on the larger size post cards, each one having an address and apartment number from my client records.
I spent alot of money on postage for these cards, and almost 30 per cent (I really think it was close to 40%, but I'll be kind) were returned with a yellow sticker saying 'non-deliverable' or 'no such address'.
After calling my clients to find out if they still lived at the posted address, every one I reached told me that they lived at that address, and at that apartment number. And we reached alot of clients.
I went to my local post office to get an explanation, only to have the blank stare given to me. No help whatsoever.
So,we called the local jurisdiction supervisor who took my information down to 'investigate'. No answer.
By this time, I had to move on and handle the the promotion another way.
Please understand, this was not bulk mail. Each postcard that I paid for had an address, and an apartment number on the card.
They were simply not delivered, and all returned to me. All from my current client list.
Roth, defend the Post office if you will, but this is not excusable.