When Texas requires citizens to pay postage on their absentee ballots, the state is requiring payment for the vote to be counted. This is an infringement of the right of every resident of the state of Texas to equal protection under the law.
In the late 19th century, the poll tax emerged in the United States as part of the Jim Crow laws. This tax, in combination with other laws, achieved the desired effect of disenfranchising African American and Native American voters, as well as poor whites.
In 1964 the 24th Amendment abolished the use of the poll tax in federal elections. In 1966, the U.S. Supreme Court extended the prohibition of the poll tax to state elections.
Texas is in violation of the constitution and the federal government should sue.