Mo. Rev. Stat. § 287.520
Any notice required under this chapter shall be deemed to have been properly given and served when sent by registered or certified mail properly stamped and addressed to the person or entity to whom given, at the last known address in time to reach the person or entity in due time to act thereon, or to counsel for that person or entity in like manner. Notice may also be given and served in like manner as summons in civil actions.
(RSMo 1939 § 3735, A.L. 1965 p. 397, A.L. 1987 H.B. 564)
Prior revision: 1929 § 3345
Effective 8-31-87
(1975) "Last known address" is that place where mail would be most likely to reach a person, that would be their residence. Failure of commission to send notice of award to residence prevented loss of jurisdiction because of 30-day rule in section 287.490. Cagle v. Regal Plastics Company (A.), 522 S.W.2d 7.