The story
Postal service in colonial Dutch East Indies was provided by the Post, Telegraph, and Telephone Service (Dutch: Post-, Telegraaf-, en Telefoondienst, PTT), established in 1906. On 27 September 1945, following the proclamation of Indonesia's independence, the central PTT office in Bandung was seized from occupying Japanese forces. It became a state-owned company in 1961 and then split in 1965 to form two separate companies, one providing telecommunication services (eventually becoming Telkom Indonesia) and the other mail and currents or giro. The new mail services company was reorganized in 1978. A government decree came into effect on 6 June 1995 to create the current Pos Indonesia.
From Wikipedia’s article on Pos Indonesia, shared under CC BY-SA 4.0.4