'We will do better' -Postmaster General DeJoy

"Too many Americans were left waiting for weeks for important deliveries of mail and packages. This is unacceptable, and I apologize to those customers who felt the impact of our delays," DeJoy said.

DeJoy, a supporter of former President Donald Trump appointed to head the Postal Service last year, suspended operational changes in August after heavy criticism over postal delays. He plans to release a new 10-year strategic "break-even" plan soon.

Delays in paychecks and other mail deliveries by the Postal Service, or USPS, gained attention last summer as a record number of voters mailed in ballots to elect a new president.