It's perfectly legal. My mail is delivered by a private carrier.
The U.S. Postal Service uses contracted delivery suppliers to support mail delivery needs and ensure it meets its universal service obligation. CDS is a contractual agreement between the Postal Service and an individual or company for the delivery and collection of mail for customers. CDS is considered one of the Postal Service’s three primary carrier delivery types (city and rural carriers, and contracted delivery suppliers). CDS suppliers1 are not Postal Service employees, but independent contractors who provide delivery service on specific routes not serviced by city or rural carriers.
Well, that's another website that needs to be discredited before it can be used to discredit the fact that transporting mail in anything other than a USPS marked vehicle is illegal. This really does go to show just how much effort the deep-state put into this illegal coup to overthrow President Trump. I bet they had that on their websites years before President Trump was even president. The fact they thought through this coup down to those details just shows how dangerous and evil these people are. It's crazy that so many people refuse to accept what's happening, and have to invent crazy theories about Biden getting more votes than Obama, Clinton, or Trump. What kind of person believes this stuff? It's as if you people are living in your own world in which you change facts and truths to fit your narrative. I'm glad I am not like that, because I hate drinking soy milk.