Tex. R. Civ. P. 239a
At or immediately prior to the time an interlocutory or final default judgment is rendered, the party taking the same or his attorney must certify to the clerk in writing the last known email address and mailing address of the party against whom the judgment is taken, which certificate shall be filed among the papers in the cause. Immediately upon the signing of a default judgment, the clerk must send written notice thereof to the party against whom the judgment was rendered as provided in Rule 21(f)(10) and to the mailing address shown in the certificate, and note the fact of such mailing on the docket. The notice must state the number and style of the case, the court in which the case is pending, the names of the parties in whose favor and against whom the judgment was rendered, and the date of the signing of the judgment. Failure to comply with the provisions of this rule does not affect the finality of the judgment.
Tex. R. Civ. P. 239a