All notices, demands and requests given or required to be given by, pursuant to, or relating to, this Agreement shall be in writing. All notices shall be deemed to have been properly given if mailed by United States registered or certified mail, with return receipt requested, postage prepaid, or by United States Express Mail or other comparable overnight courier service to the parties at its address set forth in the Defined Terms, or to such other address as such party may hereafter specify in accordance with the provisions of this Section 15 . Any notice shall be deemed to have been received upon receipt or refusal to accept delivery, in each case as shown on the return receipt or the receipt of such overnight commercial courier service.