UPDATE AS OF JUNE 2010: Thew statute has changed and now a proper posting does not require any verbage. A picture of a gun with a slash through it is now enough for a location to be considered properly posted. SECTION DELETED UNTIL I HAVE AN EXACT COPY OF THE NEW LAW
Mississippi statute says: In addition to the places enumerated in this subsection, the carrying of a concealed pistol or revolver may be disallowed in anyplace in the discretion of the person or entity exercising control over the physical location of such place by the placing of a written notice clearly readable at a distance of not less than ten (10) feet that the "carrying of a pistol or revolver is prohibited."