Quote:
39 USC § 3214 - Mailing privilege of former President; surviving spouse of former President
A former President and the surviving spouse of a former President may send nonpolitical mail within the United States and its territories and possessions as franked mail. Such mail of a former President and of the surviving spouse of a former President marked "Postage and Fees Paid" in the manner prescribed by the Postal Service shall be accepted by the Postal Service for transmission in the international mails.
Public Law 93-191, enacted December 18, 1973, amended title 39, United States Code, to clarify the proper use of the franking privilege by Members of Congress, and for other purposes.
Information on the franking privilege is available on the Arago site at
http://arago.si.edu/index.asp?con=4...=438&slide=1