58.  No person shall send by post -

(a) any indecent or obscene printing, photograph, lithograph, engraving, book or card or any other indecent or obscene article;

(b) any postal article having thereon, or on the cover thereof, any words or designs of an indecent, obscene, scurrilous, threatening or grossly offensive character;

(c) any postal article bearing any fictitious stamp or purporting to be prepaid with any postage stamp which has previously been used in payment of any stamp duty;

(d) any other article which the Commission may by regulation prohibit.