evidence: The Postal Service has experienced years of financial troubles. Last-mile delivery services it provides for Amazon are not the cause of those problems. The 2006 Postal Accountability and Enhancement Act required the Postal Service to pre-fund future retiree health benefits, not pensions. The law put a financial strain on the service, which has defaulted on some of the statutorily prescribed payments. The Postal Service has more financial problems than just the requirements of that law.