North Dakota Century Code Title 26.1. Insurance § 26.1-11-12. Additional means of service

1. Service in any action, suit, or proceeding is, in addition to the manner provided in section 26.1-01-04, valid if served upon any person within this state who on behalf of the insurance company is:

2. A copy of the process must be sent within ten days thereafter by registered mail by the plaintiff or the plaintiff's attorney, to the defendant at the defendant's last-known principal place of business.

3. The defendant's receipt, or the receipt issued by the post office with which the letter is registered or certified, showing the name of the sender of the letter, the name and address of the person to whom the letter is addressed, and the affidavit of the person mailing the letter showing a compliance herewith must be filed with the clerk of the court in which the action is pending on or before the date the defendant is required to appear or within such further time as the court allows.