For some reason, we allow mail-in ballots to be mailed on Election Day_. Perhaps requiring them to be received by Election Day would require mailing them too early. However, would it be reasonable to require all ballots mailed from within a state to be received by three days after Election Day, out-of-state ballots to be received within a week of Election Day, and only overseas ballots to be allowed two weeks. This way, all counting can be essentially completed within 10 days of the election.

What problems do you see with this approach?