The letter states, “The U.S. Postal Service in Gilmer is working to improve mail delivery in your neighborhood. The deliveries on your street have changed to curbside delivery.
“To install the box, it must be 42 inches from the curb to the bottom of the box. The box must be installed close enough to the street so that the carrier will not have to exit the vehicle.
“Please install by April 18, 2014.”