Announcements
08/26/2025
DELIVERY - Atlantic Area – North Carolina District Hurricane Erin - Offices Reopened
Contact Lists
08/26/2025
Polywrap Manufacturer List
User Guides
08/26/2025
Domestic Merchant Returns API: User Guide

This user guide provides examples of XML transactions to the USPS Merchant Returns web service and guidance for installation.

Fact Sheets
08/26/2025
PostalOne!® Contingency Plan
Publications
08/26/2025
Publication 401: Guide to the Manifest Mailing System

The USPS is amending Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM) subsection 703.2.0 to retire the manifest mailing system (MMS). Effective April 1, 2026. Please see here for more information.