A federal regulator capped USPS to one mail price increase a year through 2030, reversing a five-year run of twice-yearly hikes that still left the agency $9 billion short.

Congress made your mailbox federal territory in 1934, and the law criminalizing unstamped flyers is now central to the fight over privatizing the Postal Service. Here's what 18 U.S.C. 1725 actually says.