34 Tex. Admin. Code § 23.9
The Teacher Retirement System of Texas (TRS) may provide a summary of the benefits administered by TRS, the procedures for claiming the benefits, notice of and information related to changes in the benefits or programs administered by TRS, and any other non-confidential information required by § 802.106, Government Code, or determined by TRS to be beneficial for distribution by sending the information to a work email address provided by the member's or retiree's employer or by directing the member or retiree through a work email provided by that individual's employer to an internet website to access non-confidential information. Confidential information related to a specific member or retiree may be provided by TRS electronically to the email address provided by the member, retiree, or authorized requestor or to the member's or retiree's TRS web self-service account, provided the confidential information is encrypted or TRS has otherwise taken reasonable steps to protect the confidential information from unauthorized disclosure.
34 Tex. Admin. Code § 23.9