7 Tex. Admin. Code § 15.115
A notification by the banking commissioner under this subchapter may be by registered or certified mail, return receipt requested, and is complete when the notification is deposited in the United States mail postage prepaid, return receipt requested, mailed to the address furnished in the application. Notification may also be made in person to the applicant, or to another person, financial institution, foreign corporation or domestic corporation, or other entity subject to this subchapter, by agent-receipted delivery or by courier-receipted delivery to the address furnished in the application, by email to the email address furnished in the application, or by telephonic document transfer to the fax number furnished in the application. Notice by telephonic document transfer served after 6:00 p.m. local time of recipient is considered as notice served on the following day.
7 Tex. Admin. Code § 15.115