CHICAGO, IL - DECEMBER 19: Letters shoot through an automatic sorting machine at the Main Post Office on December 19, 2011 in Chicago, Illinois. U.S. Postal Service officials believe that Monday will... more 
CHICAGO, IL - DECEMBER 19: Letters shoot through an automatic sorting machine at the Main Post Office on December 19, 2011 in Chicago, Illinois. U.S. Postal Service officials believe that Monday will be the busiest mailing day of the holidays with more than 1.7 million cards mailed in Chicago alone. (Photo by Brian Kersey/Getty Images) less 
1 / 25
Getty Images | Photo By Brian Kersey / Getty Images
Mon, Dec 19, 2011 5:28 PM EST