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The Postal Service will incorporate revisions into the next edition of the online DMM
DMM Revision: Using Foreign Return Addresses on Domestic Mailpieces
Effective April 1, 2024, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), sections 602.1.5.4 and 609.4.3, to clarify the consequences of using foreign return addresses on domestic mailpieces.