USPS Ditches Old Manifest System for Digital Simplicity
Published Date: 11/9/2025
Rule
Summary
The Postal Service is retiring the old Manifest Mailing System on April 1, 2026. This change affects all mailers, especially small businesses, who will now use a free, easy online tool to handle their mail barcodes. No extra costs or software needed—just a smoother, simpler way to get your mail moving!
Analyzed Economic Effects
4 provisions identified: 2 benefits, 1 costs, 1 mixed.
Manifest Mailing System retired April 1, 2026
The Postal Service is retiring the Manifest Mailing System (MMS) effective April 1, 2026. After that date, mailers must use electronic documentation options such as eDoc, Full Service, Seamless, and eInduction for Letters, Cards, and Flats, or USPS Ship / Click-N-Ship for packages.
Free web tool for small business mailers
Small business mailers can use the Intelligent Mail for Small Business (IMsb) Tool, a free, web-based application that requires no software installation or downloads. The IMsb Tool generates Intelligent Mail barcodes, works via standard web browsers, and includes a user guide on PostalPro.
Package shipping moves to USPS Ship and limits commingling
For packages, the Postal Service points mailers to USPS Ship and Click-N-Ship as electronic manifest options. USPS Ship lets mailers transmit electronic files and pay postage without paper manifests, but Business Acceptance Solutions must approve these systems and mailers may not commingle USPS Ship mail with non-USPS Ship mail in the same mailing or container unless authorized.
Publication 401 removed from PostalPro
As a result of retiring MMS, Publication 401, Guide to the Manifest Mailing System, will no longer be available on PostalPro after April 1, 2026. Mailers who used Publication 401 must use the alternative electronic guidance and documentation on PostalPro.
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Key Dates
Related Federal Register Documents
2026-06376 — Revised Mailing Standards for Firearms
The Postal Service is updating its rules to ban mailing concealable firearms, following a legal opinion from the Department of Justice. This change affects anyone who ships guns through the mail and aims to keep things safer and clearer. Comments on the new rules are open until May 4, 2026, so speak up if you want to weigh in!
2026-06235 — Product Change-Priority Mail Express, Priority Mail, and USPS Ground Advantage Negotiated Service Agreements, Priority Mail, and USPS Ground Advantage Negotiated Service Agreements
The Postal Service is adding new special shipping deals for Priority Mail Express, Priority Mail, and USPS Ground Advantage. These changes affect businesses using negotiated contracts and could mean better rates or options starting soon. The official notice was filed in late March 2026, so keep an eye out for updates that might save you money or speed up your shipments!
2026-06223 — Parcel Dimension Compliance
Starting July 12, 2026, the Postal Service will require all parcels to have their exact dimensions reported in shipping manifests. This change affects anyone sending parcels and aims to improve accuracy before charging fees for dimension mistakes in early 2027. The new rules help keep shipping fair and smooth, with some fees already applying to big parcels if dimensions are missing or wrong.
2026-05768 — Overweight and Oversize Items Fee Application
The Postal Service is updating its rules about fees for overweight and oversize packages. Starting July 12, 2026, most overweight or oversize items found in the mail system will face a $200 fee before they’re released, except those caught and returned during retail transactions. This change affects anyone sending big or heavy packages and aims to keep the mail moving smoothly.
2026-05405 — Priority Mail Express and Priority Mail Open and Distribute Parcel Mailings Discontinued
Starting July 12, 2026, the Postal Service will stop offering Priority Mail Express and Priority Mail Open and Distribute for parcels as a regular service. This change mainly affects businesses and mailers who send parcels this way, but don’t worry—these parcel services will still be available through special agreements. If you use these services, keep an eye out for new options and get ready to adjust your mailing plans!
2026-05226 — Product Change-Priority Mail Express, Priority Mail, and USPS Ground Advantage Negotiated Service Agreements
The Postal Service is adding a new shipping deal for Priority Mail Express, Priority Mail, and USPS Ground Advantage to its special contract list. This change affects businesses using these services and could mean better rates or options starting soon. The official notice was filed on March 18, 2026, so keep an eye out for updates that might save you money or speed up your shipments!
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