Introduction: Australia Post is a state-owned company headquartered in Melbourne. There are 35,400 employees, 9.7 million delivery points and 4,477 retail outlets in the country. The annual mail delivery volume is about 5.3 billion pieces and it receives about 1.1 million users every day. In the past three years, Australia ¡¯s national reputation index of various companies, Australia Post has always ranked first. The postal company has obtained an AAA credit rating and is described by customers as the most trusted enterprise in Australia.