The correct answer is Bombay (now Mumbai). The East India Company started establishing post offices in India. The East India Company opened its first post office in 1727. The first post office in India was established by the British East India Company in Bombay in 1764. Chronology- In 1766 - Robert Clive sets up a regular postal system. In 1774- Warren Hastings organizes the Post Office. In 1774 - Calcutta GPO was established. In 1786 - Madras GPO was established. In 1794 - Bombay GPO was established. Additional InformationIndia Post is the trade name for the Department of Posts (DoP), a government-operated postal system in India under the Ministry of Communications. With 1, 55,531 Post Offices, the DoP has the most widely distributed postal network in the world. National Postal Week? It is celebrated from 9th to 15th October every year. World Post Day is celebrated each year on 9th October.