# Amendments to the Mailing Standards of the United States Postal Service, Domestic Mail Manual.
**AGENCY:**
Postal Service.
**ACTION:**
Final rule.
**SUMMARY:**
The Postal Service announces the issuance of the *Mailing Standards of the United States Postal Service, Domestic Mail Manual* (DMM®), dated April 7, 2025, and its incorporation by reference in the *Code of Federal Regulations.*
**DATES:**
This rule is effective May 23, 2025. The incorporation by reference of certain material listed in this rule is approved by the Director of the Federal Register as of May 23, 2025.
**FOR FURTHER INFORMATION CONTACT:**
Dale Kennedy (202) 268-6592.
**SUPPLEMENTARY INFORMATION:**
The *Mailing Standards of the United States Postal Service, Domestic Mail Manual* (DMM) provides the United States Postal Service's official prices and standards for all domestic mailing services. The most recent issue of the DMM is dated April 7, 2025. This issue of the DMM contains all Postal Service domestic mailing standards and continues to: (1) increase the user's ability to find information; (2) increase confidence that users have found all the information they need; and (3) reduce the need to consult multiple chapters of the Manual to locate necessary information. The issue dated April 7, 2025, sets forth specific changes, including new standards throughout the DMM to support the standards and mail preparation changes implemented since the version issued on January 21, 2024.
Changes to mailing standards will continue to be published through *Federal Register* documents and the *Postal Bulletin* and will appear in the next online version available via the Postal Explorer® website at: *https://pe.usps.com.*
**List of Subjects in 39 CFR Part 111**
Administrative practice and procedure, Incorporation by reference.
In view of the considerations discussed above, the Postal Service hereby amends 39 CFR part 111 as follows:
**PART 111—GENERAL INFORMATION ON POSTAL SERVICE**
**39 CFR Part 111**
1. The authority citation for 39 CFR part 111 continues to read as follows:
**Authority:**
5 U.S.C. 552(a); 13 U.S.C. 301-307; 18 U.S.C. 1692-1737; 39 U.S.C. 101, 401-404, 414, 416, 3001-3018, 3201-3220, 3401-3406, 3621, 3622, 3626, 3629, 3631-3633, 3641, 3681-3685, and 5001.
**39 CFR Part 111**
2. Amend § 111.1 by revising paragraph (b) as follows:
§ 111.1
(b) The Director of the Federal Register approved the DMM, dated April 7, 2025, for incorporation by reference as of May 23, 2025.
**39 CFR Part 111**
3. Amend § 111.3 by adding a new entry to the end of table 1 to § 111.3 to read as follows:
§ 111.3
| Transmittal letter for issue | Dated | publication |
| --- | --- | --- |
| | | |
| * * * * * * * | | |
| DMM | April 7, 2025 | [INSERT
CITATION FOR THIS FINAL RULE]. |
Colleen Hibbert-Kapler,
Attorney, Ethics and Legal Compliance.