The reports of voter fraud have already started (as expected). Sadly, there is a simple, two-part solution to this problem.
1 — We go back to paper ballots that must be filled out at the polling place, on election day, and signed by the voter who must show proper ID.
2 — After everyone has to go to the polling place, show ID, and sign a paper ballot, if more than 1% irregularity can be shown for any one candidate, ALL votes for that candidate from that polling station are nullified.
Problem solved. It would even solve the problem of dead people voting.