WaPo:

Postal workers found three tubs of uncounted absentee ballots the day after the Wisconsin primary. Some Ohioans did not receive their ballots in time for the election because of mail delays. And in Dallas, absentee ballots some voters sent to the county were returned just days before Election Day, with no explanation.

Problems caused by a spike in absentee voting during this year’s primaries are serving as potential warning signs for the U.S. Postal Service, which is bracing for an expected onslaught of mail-in ballots this fall as states and cities push alternatives to in-person voting because of the pandemic.

The concern extends to local elections offices that may be unaccustomed to aspects of the mail, such as the time it takes for parcels to reach their destinations and how to design their ballots to meet postal standards.

So the Postal Service is regularly sending advice and checklists to thousands of elections officials. Local elections offices are hiring temporary workers to process absentee ballots, and some local elections boards are adding options for voters to do curbside drop-offs of their mail ballots on Election Day.

The Postal Service is also recommending that voters request their ballots at least 15 days before Election Day and mail their completed ballots at least one week before the due date.