(a) Any unauthorized insurer issuing a policy or assuming a direct insurance risk under this surplus line law shall be deemed thereby to have appointed the commissioner as its attorney upon whom may be served all lawful process in any action or proceeding against it in this state arising out of such insurance.

(b) Service of process upon the commissioner as process agent of the insurer shall be made by the proper officer of Montgomery County by serving copies in triplicate of the process upon the commissioner or upon his assistant, deputy, or other person in charge of his office. Upon receiving such service, the commissioner shall promptly forward a copy thereof by certified mail or registered mail to the person last designated to receive the same, as provided in subsection (c) of this section, return one copy with his admission of service, and retain one copy in the files of the department.

(c) Each such policy, or the certificate of insurance issued by the broker, shall contain a provision stating the substance of this section and designating the person to whom the commissioner shall mail process as provided for in subsection (b) of this section. The broker shall, likewise, file the name of such person with the commissioner. As to the same unauthorized insurer and all insurance coverages issued or accepted by it under this surplus line law, no more than one person shall at any one time be the designee to whom copies of process against the insurer, served upon the commissioner, shall be forwarded.

(d) Where process is served upon the commissioner as an insurer's process agent, the insurer shall not be required to answer or plead except within 30 days after the date upon which the commissioner mailed a copy of the process served upon him as required by subsection (b) of this section.

(e) Process served upon the commissioner, and copy thereof forwarded as in this section provided, shall for all purposes constitute valid and binding service thereof upon the insurer.