The MAIL Act would redirect unspent federal funds that were originally allocated to the U.S. Postal Service for purchasing zero-emission delivery vehicles toward hiring and retaining postal employees in rural areas. Specifically, the bill would reprogram leftover money from the Inflation Reduction Act to support workers whose primary duty stations are in rural locations or who regularly deliver mail on rural routes. This affects rural postal employees and communities that depend on mail delivery services in less densely populated areas. The reprogrammed funds would remain available to the Postal Service until they are spent, with no specified deadline for their use. The bill essentially shifts environmental investment priorities toward workforce stability in underserved rural regions.