Indiana Code Title 27. Insurance § 27-4-4-3

Sec. 3. (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 such insurer of the insurance commissioner of the state of Indiana 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 any such contract of insurance, and any such act shall be signification of its agreement that such service of process is of the same legal force and validity as personal service of process in this state upon such insurer.

(b) Such service of process under subsection (a) shall be made by delivering to and leaving with the insurance commissioner of the state of Indiana, or in the commissioner's office, two (2) copies of the process and the payment to the commissioner at the time of such service a fee as required under IC 27-1-3-15.  The insurance commissioner shall forthwith mail by registered mail one (1) of the copies of such process to the defendant at its last known principal place of business, and shall keep a record of all process so served upon the defendant.  The service of process is sufficient, if notice of such service and a copy of the process are sent within ten (10) days thereafter by registered mail by plaintiff or plaintiff's attorney to the defendant at its last known principal place of business, and the defendant's receipt, or receipt issued by the post office with which the letter is registered, showing the name of the sender of the letter and the name and address of the person to whom the letter is addressed, and the affidavit of the plaintiff or plaintiff's attorney showing a compliance with this section are filed with the clerk of the court in which such action is pending on or before the date the defendant is required to appear, or within any further time as the court may allow.

(c) Service of process in any such action, suit, or proceeding shall in addition to the manner provided in subsection (b) be valid if served upon any person within this state who, in this state on behalf of such insurer, is:

and a copy of such process is sent within ten (10) days after the date of service under subsection (b) by registered mail by the plaintiff or plaintiff's attorney to the defendant at the last known principal place of business of the defendant, and the defendant's receipt, or the receipt issued by the post office with which the letter is registered, showing the name of the sender of the letter and the name and address of the person to whom the letter is addressed, and the affidavit of the plaintiff or plaintiff's attorney showing a compliance with this section are filed with the clerk of the court in which such action is pending on or before the date the defendant is required to appear, or within such further time as the court may allow.

(d) No plaintiff or complainant shall be entitled to a judgment by default under this section until the expiration of thirty (30) days from the date of the filing of the affidavit of compliance.

(e) Nothing in this section shall limit or abridge the right to serve any process, notice, or demand upon any insurer in any other manner permitted by law.