USPS is fueled by parcel deliveries, but also in large part by literal tons of junk mail on dead trees; spammers have paid Uncle Sam handsomely to spam every ci

USPS is fueled by parcel deliveries, but also in large part by literal tons of junk mail on dead trees; spammers have paid Uncle Sam handsomely to spam every citizen's mailbox for decades, and it's the most lucrative thing USPS can do with our home mailboxes.