Mo. Rev. Stat. § 28.700

The secretary of state may adopt rules to authorize the electronic facsimile filing of any document filed with the secretary under any provision administered by the secretary. The rules may set forth standards for the acceptance of a form of signature other than the proper handwriting of a person. A signature or document filed by electronic facsimile in accordance with rules promulgated pursuant to this section shall be prima facie evidence for all purposes that the document actually was signed by the person whose signature appears on the facsimile.