181. Official and private correspondence and use of official stationery or service stamps.
(a)All official communications or documents sent through the post shall be enclosed in official covers; those addressed to destinations within the British Empire shall be stamped with service stamps and those to foreign countries with ordinary postage stamps.(b)The unnecessary use of several service postage stamps of low value, when fewer stamps of higher denomination might be used, shall be avoided.(c)It is forbidden to use official stationery or service stamps for private correspondence or to enclose private correspondence with official communications. Officers shall not send communications on private matters, such as their leave, change of appointment, etc., by service messages, or in service-paid letters. Should a reply to such a communication be required by telegram, the cost of the reply shall be prepaid. Any infringement of this regulation should be brought to the notice of the official superiors for disciplinary action.
