All notices , demands and requests required by this Employment Agre e ment shall be in writing and shall be deemed to have been given or made for all purposes (i) upon personal delivery , (ii) one day after being sent, when sent by professional overnight courier service , (iii) five days after posting when sent by registered or certified mail , or (iv) on the date of transmissi o n when sent by telegraph , telegram , telex , or other form of " hard copy " transmission , to either party hereto at the address set forth below or at such other address as e ither party may designate by notice pursuant to this Section 6 .