Quite a Busy Day at the Post Office December 20, 2010 / 2:30 PM EST / CBS News Peter King The sorting process at the Orlando, FL Alafaya Branch Post Office, it is expected to be the busiest day of the year for processing and postmarking. Preparing for the Rush Peter King Letter carrier Dawn Sylvester, as she prepares to head out on her route. Wednesday is expected to be the busiest day of the year for deliveries. Bulk Mail Peter King Here's some of what the Postal Service expects to process today -- about 801 million pieces of mail.