| Subtype | Description |
 | A postal single is a single postal box that will be mailed to a group of people, one at a time. Only the owner of the tracker may add boxes—everyone else is just along for the ride. |
 | A postal ring is a concept where each person who joins the ring contributes a postal to be mailed in a circular fashion. Person A mails a postal to Person B who mails to Person C, and eventually returns to them from Person Z. All members of a postal ring can add boxes, but they can only add postals that have them as the listed owner. The ring leader may add postals from anyone. |
 | No subtype is the wild, wild west of postal trackers. It's not a single nor a ring, which are the most common organizations, but what it is is anyone's guess. Any participant can add postals they own, and the tracker's owner can add any postal they need to, much like a postal ring, but the organization of who mails what to whom may not follow conventional rules of rings. |
