I am 100% opposed to accepting any ballot after the day of the election.  All mail in ballots must be postmarked byt the MAIL-IN DEADLINE.  Election day is the LAST day that any vote should be counted without exception.  Aside from the obvious fraud and un-ending election returns, this sets a dangerous precedence for other aspects of state and federal government requirements.  All taxes must be postmarked by the due date.  If you can take my money and hold me accountable for the postmark, there is no reason that voting should not have the same requirement.  If you are not going to require a postmark on the ballot, you should also remove all deadlines for all taxes as well.