Editing Private Express Statutes (section)

===Other exceptions ===

Other exceptions to the PES include:
* Letters that at some point during their pick-up or delivery had previously entered into the USPS mailstream, unless the letters are consolidated.
* Letters addressed to specific persons that fall outside the purview of the PES.{{citation needed|date=July 2010}}
* Certain documents and objects that are not considered letters, even though containing a message.