Post Office (Protection) Act, 1884

Placing injurious substance in or against letter boxes.

3. A person shall not place or attempt to place in or against any post office letter box any fire, any match, any light, any explosive substance, any dangerous substance, any filth, any noxious or deleterious substance, or any fluid, and shall not commit a nuisance in or against any post office letter box, and shall not do or attempt to do anything likely to injure the box, appurtenances, or contents.

Any person who acts in contravention of this section shall be guilty of a misdemeanor, and be liable, on summary conviction, to a fine not exceeding ten pounds, and on conviction on indictment, to imprisonment, with or without hard labour, for a period not exceeding twelve months.