All Japan Post money orders are valid for 3 months after the month of issue. The last day of issue for the current Japan Post money orders is September 30, 2007, and they are payable in the United States through December 31, 2007. The maximum amount of a Japan Post money order remains unchanged at $700.00.
Postal Service employees who receive a suspicious Japan Post money order and are concerned about the validity can send an e-mail to tokyo-jc.ird01@bz01.plala.or.jp. For other questions about Japan Post money orders, contact the Postal Service St. Louis Accounting Help Desk at HelpDeskAccounting-St.LouisMO@usps.gov.
— Value Added and Special Services, Product Development, 9-27-07