Neither the name of any public official, nor any electioneering message, shall appear on tax commission correspondence with a taxpayer, whether or not it includes a check, warrant, or rebate, or on a county property tax correspondence with a taxpayer, whether or not it includes a check, warrant, or rebate, unless acting as an endorser of a check, warrant, or rebate or unless otherwise necessary for the proper execution of a check, warrant, or rebate. This provision shall not apply to standard letterhead of the tax commission or of a county.