USPS Homepage

1 Introduction

11 Purpose

111 General

The purpose of this publication is to provide supplemental information and guidance when using the mailing standards in 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 601.8–11.