Colo. Rev. Stat. § 10-13-104
Concurrently with the filing of the declaration provided for by the terms of section 10-13-103, the attorney shall file with the commissioner an instrument in writing executed by him for said subscribers, conditioned that, upon the issuance of the certificate of authority provided for in section 10-13-111, action may be brought in the county in which the property insured thereunder is situated, and service of process may be had upon the commissioner or deputy commissioner 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. Three copies of such process shall be served, and the commissioner shall file one copy, forward one copy to said attorney, and return one copy with his admission of service.
C.R.S. § 10-13-104