Proof of mailing of notice of cancellation, reduction in the limits of liability of coverage, or nonrenewal of a policy and, if required herein, the reason or reasons therefor to the named insured at the address shown in the policy, shall be sufficient proof that notice required herein has been given.
Minn. Stat. § 65B.18
1967 c 463 s 5; 1969 c 6 s 16; 1974 c 56 s 3