(a) Except as provided by Subsection (b), each written notice, decision, and report required to be sent under this chapter shall be sent by registered or certified mail, restricted delivery, return receipt requested.
(b) After written notice under Section 571.123(b) regarding the filing of a sworn complaint has been sent to a person in the manner required by Subsection (a), the commission may send the person any additional notices regarding the complaint by regular mail unless the person has notified the commission to send all notices regarding the complaint by registered or certified mail, restricted delivery, return receipt requested.