Proof of mailing shall be by affidavit of the person so mailing to the last known address of the policyholder, except that cancellation under Section 3(a)(ii) or 3(a)(iv) shall be by affidavit of delivery by the person so making that delivery, or by U.S. mails "return receipt requested". If a return receipt is requested but is returned to the sender marked "refused" or with words of similar character, the sender shall be deemed as having complied with this section.
044-14 Wyo. Code R. § 14-7