- - Contents DMM Revision: Insured Mail Clarification Effective January 21, 2024, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), section..." /> - - Contents DMM Revision: Insured Mail Clarification Effective January 21, 2024, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), section..." />