If Congress wasn't tapping it for that $5 billion per year they'd be in the black.
USPS was set up to run on postage ~ but Congress is stealing the postage!
Um, no, the USPS is running in the red. They said themselves that they were $10.5 billion in the red for 2011. After correcting for the $5 billion pension payment, they are still more than five billion in the hole.
USPS are insolvent, regardless of the pension payments.