More Information

Online Resources


Publication 28, Postal Addressing Standards, describes addressing for the best service. It is available online at

Addressing Software

For information on addressing products and services, go to the PostalPro Web site at or contact the National Customer Support Center (NCSC) at 800-238-3150.

Domestic Mail

The DMM is the Postal Service manual that contains the mailing standards governing domestic mail services, descriptions of mail classes, the conditions governing their use, and eligibility. The DMM is updated routinely and is available free of charge on the Postal Explorer Web site at

The DMM provides further information on many of the topics discussed in this publication, as follows:

  1. See DMM 201.3 for information about machinable and automation letters and cards (discussed in chapter 2).
  2. See DMM 201.2 for information about physical standards for nonmachinable letters (discussed in chapter 3).
  3. See DMM 201. 3 for information about booklets (discussed in chapter 4).
  4. See DMM 201.3 for information about letter-size pieces containing discs (CDs or DVDs) (discussed in chapter 5).
  5. See DMM 505.1 for information about Business Reply Mail items (discussed in chapter 6).
  6. See DMM 505.2 for information about Courtesy Reply Mail items (discussed in chapter 7).
  7. See DMM 505.2 for information about meter and PC Postage reply mail (discussed in chapter 8).
  8. See DMM 505.2 for information about permit reply mail (discussed in chapter 9).
  9. See DMM 202.8 for information about facing identification marks (FIMs) (discussed in chapter 10).

Latest News

The DMM Advisory keeps you informed about mailing issues that are important to your business. You can find updates to our mailing standards and prices, information about our Web tools, and helpful reminders about mailing issues. To subscribe to the DMM Advisory or to send comments and suggestions, email us at To subscribe, simply indicate “subscribe” in the subject line.

The Postal Bulletin is the official source for updates to policies, procedures, forms, and operational information about the Postal Service. The Postal Service publishes an edition every 2 weeks, and both current and archived editions are available through the Postal Explorer Web site at; under “Publications,” click on Postal Bulletin. To subscribe, submit your credit card order by telephone by calling 800-STAMP-24.

Postal Explorer

The Postal Explorer Web site at is an online library of postal information designed for business mailers. It puts a wealth of postal information at your fingertips in an easy-to-use format. The powerful search feature lets you quickly find information in a single publication or across a range of publications. You can view a publication by clicking on the publication title.

Also available on the Postal Explorer Web site are the following items:

  1. Mailing Standards of the United States Postal Service, International Mail Manual (IMM).
  2. Domestic, international, and business postage calculators.
  3. ZIP Code Lookup.
  4. Zone Chats.
  5. Postage statements.
  6. Templates for designing Business Reply Mail (BRM) and Courtesy Reply Mail (CRM) at
  7. Artwork for creating BRM at
  8. Other Postal Service publications.


Notice 123, Price List, provides retail and commercial prices for domestic and international services in a concise and accessible format. Available on the Postal Explorer Web site at The current edition of Notice 123 is available on the Postal Explorer Home Page.

Quick Service Guides

Each Quick Service Guide provides a summary of the applicable standards in the DMM. The Quick Service Guides summarize the mailing standards for a particular class of mail or preparation option, and they provide links to the DMM. The Quick Service Guides are available on the Postal Explorer Home Page, and topics include the following:

  1. Retail letters, flats, and parcels.
  2. Commercial letters and postcards.
  3. Commercial flats.
  4. Commercial parcels.
  5. Additional services.
  6. Basic standards for all mailing services.
  7. Special standards.
  8. Reference.