They could start with charging junk mail the standard first class (or postcard) price. Then they could add a feature to the Informed Delivery service that let you return pieces to sender before they're even delivered.
This isn't meant as some bare indictment to contribute to the persistent political attacks against them. Rather it shows what could be done with a growth mindset and some resources, if they were perhaps lauded as a public service and directly funded, rather than constantly under attack by societal arsonists.
