[ddingus]

Use the Post Office model. When profitable, it contributes to the general fund. See my other comment here.

Political hobbling and fuckery related to post office operations done to marginalize otherwise exemplary performance aside, the model has merit.

[fjsolwmv]

The post office has a govenrment-granted monopoly on first class mail service, and does pretty poorly when it competes for non-first-class mail logistics.

[ddingus]

A necessary monopoly. Without it, service would not be universal.