Apparently not all municipalities use postmarks, which could invalidate thousands of ballots even if they were mailed on time.

For municipalities that use postage meters for sending out their absentee ballots, a majority of their absentee ballots don’t have postmarks, he said.

Albrecht anticipated the postmark issue would become particularly problematic for ballots returned Wednesday that were clearly sent by the deadline but that don’t have a postmark. He wasn’t sure whether those ballots would be counted or if the U.S. Supreme Court’s ruling on the postmark will be interpreted literally, disqualifying ballots without postmarks on or by April 7.