Currently, 22 states have adopted some type of election law changes that will allow more mail voting to various degrees for at least their upcoming primary elections.
To the more extreme extent, five states, according to the Ballotpedia organization, are doing away with the application process and simply sending absentee ballots to every voter. They are: California, Maryland, Montana, Nevada, and New Jersey. Lawsuits to institute similar changes or make even more drastic alterations such as allowing ballot harvesting and extending the deadline to return the ballot to ten days past the election, are alive in nine additional states.
The Rundown Blog
Learn more about the candidates running in key elections across the United States.