At least here in Denmark mail voting does not just mean that you send your vote by mail. It means that you before the voting date go to a public office, a cons

At least here in Denmark mail voting does not just mean that you send your vote by mail. It means that you before the voting date go to a public office, a consulate in a foreign country, etc., show you ID, go into a voting booth and votes, and they put you vote into an envelope, that is sealed and mailed to voting place. Or that two appointed volunteers goes to e.g., a assisted living facility and witness residents voting and placing their vote in a envelope that is then sealed and mailed to a voting place.