Postal Services were available in Singapore since the island was founded by Sir Stamford Raffles in 1819. Initially, mail services were handled by the military authorities and then by the Master Attendant in 1823. The volume of mail was very small in those days and letters were collected and delivered from a single mail office. The whole establishment of the post office in the 1830s consisted of one European clerk, one local writer and a peon.

The General Post Office was closed on 23 April 1921. All the equipment were moved to a building on the recently reclaimed land at Collyer Quay, and staff worked at this temporary post office during the construction of Fullerton Building. The post office was transferred back to Fullerton Building on 23 July 1928 and has remained there since.

In 1982, the Postal Services Department merged with Telecommunication Authority of Singapore, also known as Telecoms. In 1992, Telecoms was split into three entities, the reconstituted Telecommunication Authority of Singapore (TAS), Singapore Telecommunications Limited and Singapore Post Private Limited, an associated company of Singapore Telecommunications.

Currently, the company provides mail-receiving and delivery services throughout Singapore. Letters and parcels are placed in parcel boxes or parcels or gathered in large quantities at businesses and then transported to SingPost’s sorting offices.

As of 2020, Singapore has 59 post offices, 1 self-service post office, 299 Self-Service Automated Machines (SAMs) and SAMPLUS, approximately 40 postal agents and more than 800 licensed stamp vendors. There are also 8,907 mailboxes installed at various locations across the island.

According to Wikipedia