(3)When such person cannot be found, the service may be made on any adult male member of his family residing with him; and if no such adult male member can be found, the notice may be served by fixing the copy on the outer door of the house in which the person therein named ordinarily dwells or carries on business, or by fixing a copy thereof in some conspicuous place in the office of the officer aforesaid or of the Collector or in the Court-house, and also in some conspicuous part of the land to be acquired:Provided that, if the Collector or Judge shall so direct, a notice may be sent by post, in a letter addressed to the person named therein at his last known residence, address or place of business and [registered under sections 28 and 29 of the Indian Post Office Act, 1898 (6 of 1898)] [Substituted by Act 68 of 1984, Section 25, for " registered under Part III of the Indian Post Office Act, 1866 (14 of 1866)" (w.e.f. 24.9.1984).] and service of it may be proved by the production of the addressees receipt.