The parties expressly agree that, if either party has specified any additional addresses for notices herein to which copies of any notices are to be sent and the other party fails to send copies of such notices to any such additional addresses, then such failure to send copies of such notices to any additional addresses for notices shall not render any notice delivered to the principal address for notices ineffective and any delay in such delivery shall not affect the time at which such notice to the principal address shall be effective under Section 12.