Wrong. Think again.
Dubya's decided, with a little signing statement, that he can open your mail any time he wants to, in any circumstance that he, the Decider, decides is enough of an emergency:
Most of the Postal Accountability and Enhancement Act deals with mundane reform measures. But it also explicitly reinforced protections of first-class mail from searches without a court's approval.
Yet in his statement Bush said he will "construe" an exception, "which provides for opening of an item of a class of mail otherwise sealed against inspection in a manner consistent ... with the need to conduct searches in exigent circumstances."
I would rant, but this is so shocking I think it speaks for itself. Some good commentary here.