The name post is a sponsored top-level domain

Sponsored top-level domain

A sponsored top-level domain is one of the categories of top-level domains maintained by the Internet Assigned Numbers Authority for use in the Domain Name System of the Internet....

 name (sTLD) for the Domain Name System

Domain name system

The Domain Name System is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities...

 of the Internet

Internet

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide...

. It is intended to be restricted to the use of national and regional postal services and private businesses that provide similar services. It is sponsored by the Universal Postal Union

Universal Postal Union

The Universal Postal Union is an international organization that coordinates postal policies among member nations, in addition to the worldwide postal system. The UPU contains four bodies consisting of the Congress, the Council of Administration , the Postal Operations Council and the...

, an international organization based in Bern, Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. The original time frame for approval and implementation was 2005, but ICANN did not enter into a sponsor agreement until the Fall of 2009.