It doesn't make sense that it costs money for a person to rent a box at the Post Office, but it's free to receive mail at home. If any other business ran their company this way they'd be out of business. Doesn't it cost more money to deliver mail across town than to stuff mail in a slot at the Post Office?
The Post Office could charge a nominal fee to deliver mail to individual homes and a reduced fee to deliver mail to neighborhood substations. This simple solution could reduce the costs associated with fuel and personnel significanty. It might even save this government agency from going into default.