1-3 Mailing Standards
Mailing Standards of the United States Postal Service, Domestic Mail Manual
(DMM®) provides the official mailing standards and prices for all domestic
The DMM is available for customers and employees on Postal Explorer® at
pe.usps.com. The online version includes easy-to-use interactive menus,
clickable links, and a powerful search feature. Mailers can order a printed
copy only from the U.S. Government Printing Office, 202-512-1800.
Customer Support Rulings (CSRs) provide examples of DMM standards and
how they are applied to actual mailing situations. CSRs are available at
pe.usps.com and are easy to search or sort (by class of mail, DMM
reference, and so forth).