Section 16 Regulations for preventing sending by post indecent articles, &c

Post Office regulations may be made for preventing the sending or delivery by post of indecent or obscene prints, paintings, photographs, lithographs, engravings, books, or cards, or of other indecent or obscene articles, or of letters, newspapers, supplements, publications, packets, or post cards having thereon, or on the covers thereof, any words, marks, or designs of an indecent, obscene, libellous, or grossly offensive character.