All notices, requests or other communications provided for in this Award Agreement shall be made in writing either (a) by actual delivery to the party entitled thereto, (b) by mailing in the United   States mails to the last known address of the party entitled thereto, via certified or regis ­ tered mail, postage prepaid and return receipt requested, (c) by telecopy with confirmation of receipt or (d) by electronic mail, utilizin g notice of undelivered electronic mail features.  The notice, request or other communication shall be deemed to be received (a) in case of delivery, on the date of its actual receipt by the party entitled thereto, (b) in case of mailing by certified or re gistered mail, five days following the date of such mailing, (c) in case of telecopy, on the date of confirmation of receipt and (d) in case of electronic mail, on the date of mailing, but only if a notice of undelivered electronic mail is not received.