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 ____________, _____ , 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; amended to be effective March 14, 2001, 26 TexReg 2033.