Mo. Rev. Stat. § 144.715
Notices served, how.
144.715. Notices served, how. — All notices required or authorized by sections 144.600 to 144.745 to be given by mail to any taxpayer shall be addressed to him at his last known address.
(L. 1959 H.B. 35 § 25, A.L. 1978 S.B. 661)