Clause 5

letters or postcards or both not exceeding 3 in number sent by a person for delivery by the person to another without hire, reward or other profit for receiving, carrying or delivering the letters or postcards;

any letter or postcard solely concerning the affairs of the sender or receiver thereof, sent by a messenger employed for that purpose; and

any letter or postcard solely concerning any goods or other property which is to be delivered with the letter or postcard, without hire, reward or other profit for receiving, carrying or delivering the letter or postcard, if the letter or postcard is open to inspection and has thereon the words “Consignee’s letter” or other words to the same effect.