67.  A person who otherwise than in accordance with the terms of a valid licence issued under section 51 -

(a) conveys any letter or postal article;

(b) performs any service incidental to conveying, any letter or postal article;

(c) delivers or tenders in order to be sent otherwise than in accordance with the terms of a valid licence, any letter or postal article as aforesaid; or

(d) makes a collection of letters or postal articles for the purpose of sending them;

commits an offence and shall be liable on conviction to a fine not exceeding two hundred thousand shillings or to imprisonment for a term not exceeding one year, or to both.