28 Tex. Admin. Code § 144.3
A party who sends a document relating to the arbitration proceeding to the commission or the arbitrator shall also deliver copies of the document to all other parties, or their representatives or attorneys. Delivery shall be accomplished by presenting in person, mailing by certified mail, return receipt requested, or transmitting by telephonic transmission. The document sent to the commission or the arbitrator shall contain a statement certifying delivery using the following format: "I hereby certify that I have on the ______ day of ______________, 19___, delivered a copy of the attached document to _________________________________ by _______________________ (state manner of delivery)."
Source Note:The provisions of this §144.3 adopted to be effective December 31, 1991, 16 TexReg 7358.