Tex. Gov't Code § 845.1151

The retirement system may provide confidential information electronically to a participant and to a subdivision and receive information electronically from those persons, including by use of an electronic signature or certification in a form acceptable to the retirement system. An unintentional disclosure to, or unauthorized access by, a third party related to the transmission or receipt of information under this section is not a violation by the retirement system of any law, including a rule relating to the protection of confidential information.