Indian Post Office Act, 1898
20. Transmission by post of anything indecent, etc.,
prohibited
No person shall send
by post-
(a) any indecent or
obscene printing, painting, photograph, lithograph, engraving, book or card, or
any other indecent or obscene article, or
(b) any postal
article, having thereon, or on the cover thereof, any words, marks or designs
of an indecent, obscene, seditious, scurrilous, threatening or grossly
offensive character.