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The Postal Administrations of the various countries composing the Union are competent to establish by mutual agreement, in a Regulation of Execution, all the measures of order and detail which are judged necessary.


The several Administrations may, moreover, make among themselves the necessary arrangements on the subject of questions which do not concern the Union generally, provided that these arrangements are not contrary to the present Convention.


The Administrations interested are, however, permitted to come to mutual arrangements for the adoption of lower rates of postage, within a radius of 30 kilometers, for the conditions of the delivery of letter by express, as well as for the exchange of post-cards with paid answer. In this latter case, the answer-cards, when sent back to the country of origin, are exempt from the transit charges stipulated by the last paragraph of Article 4 of the present Convention.