hhmoore
tired & cranky shadow
What's the matter, somebody has to tell you everything? It's posted right on USPS.com, all you have to do is look for it. Or isn't the Postal Service's own website enough indication that it isn't allowed?
http://pe.usps.gov/text/pub52/pub52c5_006.htm
http://pe.usps.gov/text/pub52/pub52c5_006.htm