Indiana Code Title 27. Insurance § 27-6-6-4

Sec. 4.  (a) Concurrently with the filing of the declaration provided for by the terms of section 3 of this chapter, the attorney (as defined in section 2 of this chapter) shall file with the department of insurance, state of Indiana, an instrument in writing, executed by him for said subscribers, conditioned that, upon the issuance of a certificate of authority provided for in section 9 of this chapter, service of process may be had upon the individual resident of Indiana, corporate resident of Indiana, or authorized Indiana insurer, appointed by the subscribers as the subscribers' agent for service of process in all suits in this state arising out of such policies, contracts, or agreements, which service shall be valid and binding upon all subscribers exchanging at any time reciprocal or interinsurance contracts through such attorney.

(b) Service of process under subsection (a) shall be made by delivering to the subscribers' agent two (2) copies of process with a complaint attached.

(c) It shall be the duty of the subscribers' agent, upon service, to promptly send one (1) copy of such summons, by registered letter, to the attorney specified in subsection (a) and to file the other copy of summons in the office of the subscribers' agent.