without authority whilst so employed, or whilst the mail bag or postal packet is in his custody or possession, leaves it, or suffers any person, not being the person in charge thereof, to ride in the place appointed for the person in charge thereof in or upon any vehicle used for the conveyance thereof, or to ride in or upon a vehicle so used and not licensed to carry passengers, or upon a horse used for the conveyance on horseback thereof;

is guilty of any act of drunkenness whilst so employed;

is guilty of carelessness, negligence or other misconduct whereby the safety of the mail bag or postal packet is endangered;

without authority collects, receives, conveys or delivers a postal packet otherwise than in the ordinary course of post;

gives any false information of an assault or attempt at robbery upon him; or

loiters on the road or passage, or wilfully misspends his time so as to retard the progress or delay the arrival of a mail bag or postal packet in the course of transmission by post, or does not use due care and diligence safely to convey a mail bag or postal packet at the due rate of speed,