Many states allow mail in votes, doesn't change the fact that it's dangerous and easy to perpetrate fraud. Democrats and Republicans should be concerned.
The process is that you mail it in and then either a Republican or Democrat counts it in a private building with no surveillance.
They can easily lose votes or change them.
Ideally we would go back to paper ballots that are printed on money paper with holographic silver ink so they would be super hard to fake.
They should be counted in a room with a live public feed cameras in a room with a glass table by people in tight fitting clothing that are searched before they go in. They would be equally split between supporters from all viable candidates.
They would be counted by each individual separately.