Tex. R. Civ. P. 119
As amended through August 27, 2024
The defendant may accept service of process, or waive the issuance or service thereof by a written memorandum signed by him, or by his duly authorized agent or attorney, after suit is brought, sworn to before a proper officer other than an attorney in the case, and filed among the papers of the cause, and such waiver or acceptance shall have the same force and effect as if the citation had been issued and served as provided by law. The party signing such memorandum shall be delivered a copy of plaintiff's petition, and the receipt of the same shall be acknowledged in such memorandum. In every divorce action such memorandum shall also include the defendant's mailing address.
Tex. R. Civ. P. 119