Effective November 2, 2026, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), in various sections, to clarify the preparation standards.
Although these revisions will not be published in the DMM until November 2, 2026, the standards are effective immediately.
Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM)
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200 Commercial Mail Letters, Cards, Flats, and Parcels
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204 Barcode Standards
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3.0 Standards for Barcoded Tray Labels, Sack Labels, and Container Labels
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3.2 Specifications for Barcoded Tray and Sack Labels
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3.2.4 3-Digit Content Identifier Numbers
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Exhibit 3.2.4 3-Digit Content Identifier Numbers
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CLASS AND MAILING CIN HUMAN-READABLE
CONTENT LINE
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USPS MARKETING MAIL
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[Delete section “MKT Flats — Cotrayed Automation and Nonautomation” in its entirety.]
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207 Periodicals
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22.0 Preparing Nonbarcoded (Presorted) Periodicals
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22.6 Sack Preparation
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[Revise the text of item d(2) to read as follows:]
2. Line 2: “PER” or “NEWS” as applicable; followed by “FLTS” or “NONSTD” as applicable; followed by “WKG.”
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230 Commercial Mail First-Class Mail
233 Prices and Eligibility
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4.0 Additional Eligibility Standards for Nonautomation First-Class Mail
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4.3 Price Application – Nonautomation Machinable – Letters
[Add between the title of 4.3 and the introductory text of 4.3 a title to read as follows and renumber current 4.3.1, 4.3.2, and 4.3.3 as new 4.3.2, 4.3.3, and 4.3.4, respectively:]
4.3.1 General
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4.3.2 3-Digit Price
[Revise the text of renumbered 4.3.2 to read as follows:]
The 3-digit price applies to qualifying letter-size machinable pieces (see 201.1.0) placed in origin/entry SCF trays (regardless of quantity), in full trays for a single SCF, and to pieces placed in mixed trays in lieu of overflow SCF trays.
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