They could go to every other day delivery and close a lot of old facilities, but then govt. employees would lose jobs.
I think it would be fun to swamp them with postage due mail, things they have to stop and try to collect a nickel on. It’s the civil disobedience side of me, take an agency down.
Years ago when one of my daughters was in high school she and her friends had a little post office scam going. It was for greeting cards.
They would mail it to themselves with the person they wanted to receive it as the return address.
No postage.
Voila,return to sender.
Greeting card received.