The bills you pay online are mailed from your bank to their respective debtor. And they pull no money from the feds, so its not like they are "propped" up. They sustain themselves.
ummm, things paid online are done via wire transfer, at least mine are
and the usps gets loans from the treasury, they dont have to go to a bank and beg like most business.
look at the news the postmaster has said they need to cut out saturday service to break even
Postal Service may drop Saturday delivery - Business - U.S. business - msnbc.com
they had a 8.5bill loss last year, double the previous year
Post Office posts $8.5 billion loss for last year - Business - U.S. business - msnbc.com