The Gift of ... Snail Mail? By: FOX Business May 06, 2011 at 13:56 PM EDT Starting in June, the cash-strapped U.S. Post Office will offer cards issued by American Express, Discover, MasterCard or Visa on a two-year trial basis at 2,000 offices. Read More >> Related Stocks: American Express Discover Financial Services Macy's MasterCard United Parcel Service Visa