Effective September 10, 2018, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), by adding section 604.8.4 to address Priority Mail Express® (PME) items bearing invalid postage that have been detected by a Postal Service device, such as Intelligent Mail® Device (IMD), Mobile Point-of-Service, Retail System Software (RSS), or other technology. The Postal Service will affix new Label 424, Invalid Postage Return Label (shown below), to PME items bearing invalid postage and return these items to the sender.
Initial distribution of Label 424 to all retail units will take place by the end of June. To reorder Label 424, use the Material Distribution Center eBuy2 catalog and search under PSN 7690-03-000-0379.
Although the Postal Service will not publish this clarification in the DMM until September 10, 2018, the standard will be effective July 13, 2018, in tandem with RSS and IMD software deployment.
Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM)
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600 Basic Standards for All Mailing Services
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604 Postage Payment Methods and Refunds
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8.0 Insufficient or Omitted Postage
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[Add new section 8.4 to read as follows:]
8.4 Invalid Postage
Priority Mail Express items bearing invalid postage detected by a Postal Service device must have a Label 424, Invalid Postage Return Label, affixed and be returned to sender.
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The Postal Service will incorporate this revision into the next online update of the DMM, which is available via Postal Explorer® at pe.usps.com.
