Quayboardwarrior: Postal service originally was limited to official mail, and did not include home delivery (that was added during the Civil War so women whose husbands were off fighting wouldn’t have to go to the post office, which often was run by the local inn, which often doubled as a “Beis Zenus”). Rural free delivery and parcel post were also late add-ons.
If you made internet access a entitlement (as was telephone service by the late 20th century), you could probably get rid of paper mail service.