Manifest Mailing System

Effective April 1, 2026 - The Postal Service is retiring Publication 401 Manifest Mailing System (MMS) used for mail sortation and preparation with hard copy forms and documentation. Affected customers must migrate to Electronic Documentation (eDoc), Full Service, Seamless, and eInduction, for Letters, Cards, and Flats April 1st, 2026.

Mailers who require a onetime exception to continue using the Manifest Mailing System—due to an inability to meet the deadline to migrate to Full Service, Seamless, or USPS Ship, may do so by submitting their request to their local Manager Business Mail Entry. Download the request form from PostalPro and complete the mailers section of the document.

Please note that exceptions will not be extended beyond May 1, 2026.

Latest Updates

03/04/2026 Manifest Mailing System Exception Request Form

02/12/2026 Manifest Mailing Systems Retirement Fact Sheet

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Overview & Benefits

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Mailers should consult with their Business Mail Entry Unit to determine the appropriate next steps based on their specific mail types and preparation methods.

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