Postal Service Woos Web Retailers With Same-Day Delivery Test - Bloomberg The U.S. Postal Service, struggling to stem billions in losses as first-class mail usage declines, plans to test a same-day delivery service that would help Internet retailers ship their customers’ purchases more quickly. During the trial of Metro Post, which begins in mid- November in San Francisco, the postal service would deliver packages during the evening that were received before 2 to 3 p.m., said Susan McGowan, a spokeswoman. The Postal Service is in talks with online retailers and anticipates working with as many as 10 companies during the trial. The agency must obtain approval from the Postal Regulatory Commission before moving ahead, McGowan said.