For the purpose of this Agreement, notices and all other communications provided for shall be in writing and shall be deemed to have been duly given when delivered or mailed by United States first class mail, postage pre-paid, addressed to the last known residence address of Executive or in the case of the Company, to its principal office to the attention of its then Chief Executive Officer, with a copy to its Secretary, or to such other address as either party may have furnished to the other in writing in accordance herewith, except that notice of change of address shall be effective only upon receipt.