It’s one thing to allow a limited number of ballots to arrive for military or absentees. But states that conduct elections primarily by mail (Oregon, Colorado) require ballots to arrive by Election Day.
Utah allows ballots to be postmarked the day before the election, so long as they are received before noon of the day of the county canvass (generally, the day after the election but as late as ten days after the election, depending on the county). https://www.vote.org/utah/
(I have participated in election litigation in multiple states. I know more about election law than you do. You will not win this battle.)
Washington allows ballots to be postmarked the day of the election: https://www.sos.wa.gov/elections/dates-and-deadlines.aspx
Utah allows ballots to be postmarked the day before the election, so long as they are received before noon of the day of the county canvass (generally, the day after the election but as late as ten days after the election, depending on the county). https://www.vote.org/utah/
(I have participated in election litigation in multiple states. I know more about election law than you do. You will not win this battle.)