Mail-in voting has long worked for citizens to have a say in democracy
Mail-in voting is not now nor has never been an issue. Soldiers have used the mail to vote since the Civil War.
Some states use mail-in ballots completely. This is another trumped-up nonsense story. Unless the Post Office is destroyed by the corrupt Republicans, mail-in voting will continue as usual.
Maybe try reading or watching actual news? This helps with critical thinking.