All notices under this Agreement shall be in writing and shall be deemed to have been dully given if personally delivered against receipt or if mailed by first class registered or certified mail; return receipt requested, addressed to Company and to Employee at their respective addresses set forth in the first page of this Agreement, or to such other person or address as may be designated by like notice hereunder. Any such notice shall be deemed to have been given on the day delivered, if personally delivered, or on the third day after the date or mailing if mailed.