60 Communications No. 34 (c) opening of a postal article for purposes of ascertaining details pertaining to the sender or addressee that are necessary inorder to return or deliver the postal article; or (d) opening of a postal article that is reasonably suspected to contain material or substances whose dispatch, use, importation, exportation or distribution is prohibited or regulated by law. (4) An employee of the Malawi Posts Corporation may open any mail, if authorized to do so by express warrant of the Postmaster general. (5) The Postmaster general may grant a warrant to open any mail in any individual circumstances if he has reason to believe that an offence may have been committed under this Act or any other written law. Postage stamps and postal charges Philatelic materials Exemption from postal charges (6) A person who fails to comply with this section commits an offence and shall, upon conviction, be liable to a fine of k500,000 and imprisonment for twelve months. 128.__(1) A public postal licensee shall have exclusive rights to issue postage stamps, but may enter into an arrangement with any entity to sell the postage stamps. (2) A public postal licensee may, subject to such rules as the Authority may prescribe, issue postage stamps of such kinds and denoting such values as the licensee may deem necessary for the purposes of this Part. (3) Any postage stamp issued under this section shall be used for the payment of any postage or other sum chargeable under this Act in respect of any postal service, except where the Authority determines that the payment may be made in some other manner. 129. Philatelic materials produced by a public postal licensee shall__ (a) belong to the government and shall be kept in such custody as the Authority may direct; and (b) include__ (i) postage stamps; (ii) artwork, proofs, progressive sheets, printed sheets and printed plates of postage stamps; and (iii) date-stamps, slogan dyes, and other artefacts used in connection with the production of postage stamps. 130.__(1) The Authority may make rules governing the exemption of certain classes of entity from postal charges on postal articles, from commissions, fees or other charges payable for