The Grand Postal Service.

The Grand Postal Service is responsible for delivering mail within the borders of the Highlands. Along the Major Routes message traffic is sent through the hypercable communication system. The Postal Service primarily delivers packages along the Major Routes. A very small amount of express mail document delivery is done by the Postal Service to worlds on Major Routes, primarily special government and Church documents.
Postal routes join together worlds on the Blue Highways and worlds off the road network entirely. Much of this traffic travels on Postal Couriers, tractors which tow a postal module. Modules come in several varieties. Most consists of a cargo area for packages and a bank of computer storage for electronic traffic. Once the courier arrives in system it will broadcast its electronic message traffic to the local system communication network. Traffic which is for systems farther down the postal route is transmitted to another courier. Packages are transfered at the portal gate along Blue Highways or to orbital stations most other places. On a few worlds mail is actually delivered to the planetary starport.
At the borders postal routes sometime connect with external package services. A greater amount of non-electronic physical mail is also delivered to external partners. Such mail often is actually digital in nature, but delivered on physical media, both for greater security and to prevent data degradation.
Employees of the Grand Postal Service are known as Posties. The actual duties of the postie varies considerably depending upon where in the postal system the worker is assigned. Postal Couriers on Major Routes tend to travel repetative routes which have them on the road for two to three weeks on a circular route, with a week off at their home. Blue Highway couriers tend to spend more time on the road, often running down the road for months before taking significant time off at home. Off road postal couriers often deliver to a single off road world spending only a week or so in space and then returning. Some few spend almost all their time in larger schooner vessels traveling to a string of of road destinations. This is most common at the border regions.