GAO Says USPS Must Comply with Six-Day Provision: In a letter addressed to Congressman Gerald E. Connolly, the U.S. Government Accountability Office (GAO) deemed Postmaster General Patrick Donahoe's claim that the U.S. Postal Service (USPS) isn't obliged to comply with the six-day delivery provision as a “faulty USPS premise.” Through this interpretation, the USPS is legally compelled to “continue six-day delivery and rural delivery of mail at not less than the 1983 level.” In effect, this means the GAO rejects that the USPS can reduce mail delivery service to five days.