Link to "IMM Revision: Individual Country Listing for Guatemala" Link to contents for "Policies, Procedures, and Forms Updates"      Link to "IMM Revision: Elimination of Direct Sacks of Printed Matter to One Addressee (M–bags) to Lithuania"

IMM Revision: Individual Country Listing for Japan

Effective February 5, 2026, the Postal Service™ is revising the Individual Country Listing for Japan in Mailing Standards of the United States Postal Service, International Mail Manual (IMM®) to reflect that infectious substances and radioactive materials are prohibited.

These revisions are based on a formal request that Japan Post (the designated postal operator of Japan) made through the Universal Postal Union via International Bureau Circular 198, dated December 8, 2025.

Mailing Standards of the United States Postal Service, International Mail Manual (IMM

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Individual Country Listings

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Japan

Country Conditions for Mailing

Prohibitions

[Revise the list by adding the following two entries in alphabetical order: Infectious substances and Radioactive materials.]

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Although effective February 5, 2026, the Postal Service will incorporate these revisions into the next edition of the online IMM, which is available via Postal Explorer® at pe.usps.com.

— Product Classification,
Product Solutions, 2-5-26




Link to "IMM Revision: Individual Country Listing for Guatemala" Link to contents for "Policies, Procedures, and Forms Updates"      Link to "IMM Revision: Elimination of Direct Sacks of Printed Matter to One Addressee (M–bags) to Lithuania"