7 Tex. Admin. Code § 105.2
The notice of hearing to a party in a contested case shall be by personal service or by registered or certified mail to the party's last known address as shown by records of the Agency. Service by mail shall be complete upon deposit of the document, enclosed in a postpaid, properly addressed wrapper, in a post office or official depository under the care and custody of the United States Postal Service.
Source Note:The provisions of this §105.2 adopted to be effective April 8, 1997, 22 TexReg 3213; amended to be effective December 6, 1998, 23 TexReg 12292.