Tennessee Code Title 56. Insurance § 56-2-602

(a) Any of the following acts in this state, effected by mail or otherwise, by an unauthorized foreign or alien insurer, is equivalent to and shall constitute an appointment by the insurer of the commissioner and the commissioner's successor or successors in office, to be its true and lawful attorney, upon whom may be served all lawful process in any action, suit, or proceeding instituted by or on behalf of an insured or beneficiary arising out of the contract of insurance:

(b) Any of the acts mentioned in subdivisions (a)(1)-(4) shall be signification of the insurer's agreement that the service of process is of the same legal force and validity as personal service of process in this state upon the insurer.