THE U.S. POSTAL SERVICE
'(<a href="http://www.j-archive.com/media/2005-12-16_J_11.jpg" target="_blank">Kelly of the Clue Crew holds up blue envelope with an eagle logo.</a>)  Express Mail, which delivers overnight, recalls the name of this service that delivered Lincoln's inaugural address to the West Coast in just 7 days'
the Pony Express