January 26, 2020

 Mailing Standards of the United States Postal Service, International Mail Manual (IMM) provides our standards for all international mailing services and references for the applicable prices. Many mailers find it helpful to reference these standards as they prepare and deposit their mail.

Mailers looking for an overview of prices and international extra services can use Notice 123Price List. It provides the most commonly sought international mailing information in an easy-to-read and easy-to-find format. Notice 123 is available on our Postal Explorer Web site at pe.usps.com. The Postal Explorer Web site also provides helpful search features, mailing tools, and price calculators to make mailing easy.

Summary of Changes

The IMM is updated frequently on Postal Explorer at pe.usps.com. The Summary of Changes section in the IMM notes revisions by IMM chapter, subchapter, part, section, or Individual Country Listing (ICL). Mailing standards in the IMM are revised by notices published in the Postal Bulletin or the Federal Register.


The current edition of the IMM and also archived editions back to 2001 are available in PDF and HTML formats on the Postal Explorer Web site at pe.usps.com.

How to Use This Book

The IMM is organized into nine chapters that describe mailing methods based on shape of mail, category of mail service, and topic. The chapters are followed by Individual Country Listings that contain specific mailing standards for each country.


Contact your local Post Office, business mail entry office, or the Pricing and Classification Service Center (PCSC) with comments or questions about our mailing standards. Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM) section 608.8.4 provides addresses and telephone numbers of business mail entry offices and the PCSC.

Dale E. Kennedy
Product Classification