All notices required or permitted hereunder shall be in writing and shall be served on the parties at the addresses set forth in Section 1.3 . Any such notices shall, unless otherwise provided herein, be given or served (a) by depositing the same in the United States mail, postage paid, certified and addressed to the party to be notified, with return receipt requested, (b) by overnight delivery using a nationally recognized overnight courier, (c) by personal delivery, or (d) by electronic mail addressed to the electronic mail address set forth in Section 1.3 for the party to be notified with a confirmation copy delivered by another method permitted under this Section 12.10 . Notice given in accordance herewith for all permitted forms of notice other than by electronic mail, shall be effective upon the earlier to occur of actual delivery to the address of the addressee or refusal of receipt by the addressee. Notice given by electronic mail in accordance herewith shall be effective upon the entrance of such electronic mail into the information processing system designated by the recipient’s electronic mail address. Except for electronic mail notices as described above, no notice hereunder shall be effective if sent or delivered by electronic means. In no event shall this Agreement be altered, amended or modified by electronic mail or electronic record. A party’s address may be changed by written notice to the other party; provided, however, that no notice of a change of address shall be effective until actual receipt of such notice. Copies of notices are for informational purposes only, and a failure to give or receive copies of any notice shall not be deemed a failure to give notice. Notices given by counsel to the Purchaser shall be deemed given by Purchaser and notices given by counsel to the Seller shall be deemed given by Seller.