You can email them directly with a question or comment at firstname.lastname@example.org
You can go to their web page at http://dor.state.mo.us to find additional forms and tools concerning your Missouri taxes.
You may also contact them through one of the following methods:
Phone: (800) 877-6881
TDD: (800) 735-2966
Fax: (573) 526-1881
Missouri Forms-by-Fax system: (573) 751-4800