(1)No article shall be transmitted by post in any envelope with an open (cutout) panel which does not conform to the following conditions, namely:-(a)the open (cut-out) panel must not exceed 10cm. in length by 3.5 cm. in breadth;(b)the panel must extend parallel to the length to the envelope.(c)a minimum space of 1.5 cm. must be left above the panel for the postage stamp and the date-stamp and the date-stamp impression;(d)no writing or printing other than the address may be visible through the panel and the address must appear through the panel in such a manner as can be read easily;(e)the enclosure must be so folded that it cannot move about in the envelope and thus cause the address to be hidden;(f)a minimum space of at least 1.5 cm must be left between the sides and base of the cut-out panel and the respective edges of the envelope.(2)If during the transmission by post an envelope with an open (cut-out) panel is found to be not in conformity with the provision of sub-rule (1), it shall be returned to the sender.Redirection of postal articles
