Sending a letter is actually the best way to directly contact the Postmaster General. You can address the letter to:

Megan J. Brennan
Postmaster General and Chief Executive Officer
475 L’Enfant Plaza, SW
Room 4012
Washington, DC 20260-2200

The post office just wants to blame every bit of incompetency on the virus now. We are all dealing w/ the virus issues in life and we ALL still have to do our jobs. Excuses from the post office for lost packages don’t pay bills. Two packages picked up on May 19th and one not scanned in until the 21st! And until it miraculously showed up they claimed it was never picked up here. Nevermind our video. Demand better! You can not sue a local post office but you can write the post office general, the CEO, and demand better.