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Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > 1 Introduction
The purpose of this publication is to provide supplemental information and
guidance when using the mailing standards in the Mailing Standards of the
United States Post Office, Domestic Mail Manual (DMM). The primary rules
that apply to the mailing of hazardous materials, restricted matter, and
perishable matter and that have precedence over all other postal information
are found in DMM 601.8-601.11.
This publication is designed for use by Postal Service personnel in business
mail entry and retail units, marketing, and other functional areas that are
involved with providing mailability information to Postal Service customers.
Follow the mailing standards in the DMM, along with the additional guidelines
contained in this publication, when deciding whether and under what
conditions hazardous materials, restricted matter, and perishable matter are
permitted to be mailed.
The content of this publication is based on DMM standards and regulations
of federal agencies in effect at the time of publication. Future changes to the
DMM or federal regulations may supplement, amend, or supersede the
content of this publication.
No single guide could provide all the details necessary for the safe
acceptance and handling of every item that is classified as hazardous
material, restricted matter, or perishable matter. This publication provides
general guidelines, along with specific mailability requirements, where
possible, for those categories of harmful materials that present significant
danger or are frequently presented for mailing.
In writing this publication, the following sources were used:
• Title 18 United States Code 1716 (18 USC 1716).
• Title 39 United States Code 3001 (39 USC 3001).
• Domestic Mail Manual (DMM) 601.8-601.11.
• International Mail Manual (IMM) 135-139.
• Title 49 Code of Federal Regulations (49 CFR).
• Postal Operations Manual (POM).
• Administrative Support Manual (ASM).
Where appropriate, the names and addresses of agencies where more
detailed information can be obtained are provided in this publication.
Appendix F lists Postal Service publications and reference materials and
other publications.
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