(1) Service of process against a domestic insurer must be made pursuant to 35-7-113 or in any other manner permitted by law. (2) Service of process against a domestic reciprocal insurer must be on the attorney-in-fact or in any other manner permitted by law.
Service Of Process -- Domestic Insurer
Mont. Code Ann. § 33-1-604, under Service of Process.
Mont. Code Ann. § 33-1-604