51. Official and private correspondence, and use of official stationery or service stamps. - (a) All official communications or documents send through post shall be enclosed in official covers; those addressed to destination in India shall be stamped with service stamps and those to other 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 by service messages or in service paid letters. Any infringement of this regulation shall be brought to the notice of the official superiors for disciplinary action.
