CBS News: On-time delivery plunges at USPS
"The U.S. Postal Service's delivery stumbles drew scrutiny last year when an influx of election mail and operational changes caused service to deteriorate. Yet while the crush of ballots has passed, those woes have only worsened: 1 in 5 pieces of mail across the U.S. was delivered late to households and businesses in the first three months of 2021, according to postal agency data."