It is unlawful to get married by proxy unless you are in the military.

The Law Explained

Texas is one of the very few states that still formally allows proxy marriage, where someone else physically stands in for a bride or groom who cannot attend the ceremony. However, to prevent fraudulent marriages or forced unions, the state strictly limited this privilege. Today, it is illegal to use a proxy unless the absent party is an active-duty member of the armed forces stationed away from home.