From a companion story on the Channel 4 Web site:

When the nation's businesses experience a downturn, it directly affects the volume of mail. Economic decline leads to a decline in mail volume. The current year is particularly challenging since mail volume has declined significantly

In order to remain economically viable, the Postal Service must make changes to its operations, staffing, and facilities to match current mail volume and to maintain the service performance the American public has come to expect.

We will contact the local branch later this morning to see if there are more details on when and where in particular these changes will take effect.