(a) Service of notice of hearing. A notice of hearing shall be served by personal delivery or by registered or certified mail, return receipt requested, to the person's last known address.     
      (b) Service of orders.      
        (1) All emergency orders issued pursuant to the Act, §23-2, shall be sent in the manner prescribed therein.       
        (2) All other orders shall be served in the manner prescribed by the APA.       
      (c) Service of all other documents. Unless otherwise required by the Act, the APA, SOAH Rules of Procedure, or Board rules, all documents, other than a notice of hearing or an order, may be served on each party or the party's representative by:      
        (1) hand-delivery;       
        (2) regular, certified, or registered mail;       
        (3) electronic mail, upon agreement of the parties; or       
        (4) facsimile transmission.       
     Source Note:        The provisions of this §105.6 adopted to be effective April 3, 2012, 37 TexReg 2165