Texas Civil Practice and Remedies Code - CIV PRAC & REM § 172.005. Date Written Communications Received

(a) Except as agreed by the parties, a written communication is received on the day that it is delivered:

(b) If a place described by Subsection (a) cannot be found after a reasonable inquiry, a written communication is received if it is sent to the addressee's last known place of business, habitual residence, or mailing address by registered mail or other means that provides a record of the attempt to deliver it.

(c) This section does not apply to a written communication relating to a court proceeding.