Special conditions as to postcards and printed matter

Notwithstanding anything contained in regulation 15 of these Regulations, undeliverable postcards, printed papers and newspapers, chargeable with postage not exceeding three cents shall not be returned to the sender unless his name and address appear on the outside of the packet, together with a request for return in case of non-delivery. Postage equal to the original postage shall be charged for the return of such packets.