(1) All notices, pleadings, exhibits, correspondence specific to an appeal, and other papers submitted to the board shall be served upon all counsel and representatives of record and upon unrepresented parties or upon their agents designated by them or by law.

(a) Service shall be made personally or, unless otherwise provided by law, by first-class, registered, or certified mail; by fax and same-day mailing of copies; or by commercial delivery company.

(b) Service by mail shall be regarded as completed upon deposit in the United States mail, as evidenced by the postmark, properly stamped and addressed. Service by fax shall be regarded as completed upon production by the fax machine of confirmation of transmission and deposit on the same day in the United States mail. Service by commercial delivery shall be regarded as completed upon delivery to the delivery company, properly addressed with charges prepaid.

(2) Proof of service. Where proof of service is required by statute or rule, receipt of the papers by the board, together with one of the following, shall constitute proof of service:

(a) An acknowledgement of service.

(b) A certificate that the person signing the certificate served the papers upon all parties of record in the proceeding by delivering a copy thereof in person to (names).

(c) A certificate that the person signing the certificate served the papers upon all parties of record in the proceeding by:

(i) Mailing a copy thereof, properly addressed with postage prepaid, to each party to the proceeding or his or her attorney or authorized agent; or

(ii) Transmitting a copy thereof by fax, and on the same day mailing a copy, to each party to the proceeding or his or her attorney or authorized agent; or

(iii) Depositing a copy thereof, properly addressed with charges prepaid, with a commercial delivery company.