18 U.S. Code § 1701
Whoever knowingly and willfully obstructs or retards the passage of the mail, or any carrier or conveyance carrying the mail, shall be fined under this title or imprisoned not more than six months, or both.
Send him a card protesting:
This is the home of our Postmaster General, Louis Dejoy. His address is 806 Country Club Dr, Greensboro, NC, 27408-5601. Feel free to join me in sending him a letter via the United States Postal Service.