71.  Any person, who without lawful excuse, the proof of which shall lie on the person charged, sends or procures to be sent by post, a postal article which has thereon or enclosed therein any word, drawing or picture of a scurrilous, threatening, obscene or grossly offensive character, commits an offence and shall on conviction be liable a fine not exceeding three hundred thousand shillings, or to imprisonment for a term not exceeding three years or to both.