Hong Kong authorities are seeking to inject HK$4.6 billion (US$587 million) into the government-owned postal service provider to sustain its operations for the next three years, following eight years of operating losses and declining mail volumes.A document submitted to Legislative Council on Wednesday by the Commerce and Economic Development Bureau showed a bruising fiscal trajectory for the Post Office Trading Fund (POTF) of Hongkong Post since 2017-18.Self-financing since 1995, Hongkong...