For the purpose of this Agreement, notices and all other communications provided for in this Agreement shall be in writing and shall be deemed to have been duly given when delivered by hand or overnight courier or three postal delivery days after it has been mailed by registered mail, return receipt requested, postage prepaid, addressed to the respective addresses set forth on the first page of this Agreement, or to such other address as any Party may have furnished to the other Parties in writing in accordance herewith, except that notice of change of address shall be effective only upon receipt.