Wow.  Courtesy of the official blog of the USPS Inspector General:

“The Path Forward” of the Postal Service

The money quote:

“The Postmaster General warned that if the Postal Service continues to operate as it is, it will run a cumulative debt of $238 billion over the next 10 years. Even if the Postal Service institutes every conceivable control within management control – product and service actions, productivity improvements, workforce flexibility improvements and purchasing savings – it can only shrink the debt to $115 billion.”