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Convention (XI) relative to certain Restrictions with regard to the Exercise of the Right of Capture in Naval War. The Hague, 18 October 1907.
Chapter I : Postal correspondence - Art. 1.
Article 1. The postal correspondence of neutrals or belligerents, whatever its official or private character may be, found on the high seas on board a neutral or enemy ship, is inviolable. If the ship is detained, the correspondence is forwarded by the captor with the least possible delay.
The provisions of the preceding paragraph do not apply, in case of violation of blockade, to correspondence destined for or proceeding from a blockaded port.