nt size="2 The U.S. Postal Service has filed a negotiated service agreement request for Bank of America with the Postal Regulatory Commission, the first NSA request based purely on cost savings rather than requiring a volume threshold for the incentives. NSAs are special service and rate arrangements between the USPS and a mailer or group of mailers. Proponents say NSAs encourage greater volume by rewarding postal customers with discounts and premium services.