08/27/2025
08/27/2025
USPS® Approved Manufacturers of Mailing Containers for Adult Birds
A list of contact information for adult bird container manufacturers that have been certified by USPS.
08/26/2025
2026 Integrated Technology Promotion
The 2026 Integrated Technology Guidebook provides you with all the details you need to successfully participate in this promotion. In the Guidebook you will find information on the eligibility, information on the Mailing Promotions Portal, and more. Navigate the document via the buttons on the side to quickly access the information most relevant to you.
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| Integrated Tech Enrollment Guide |
08/26/2025
08/26/2025
08/26/2025
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.
08/26/2025
08/26/2025
Publication 401: Guide to the Manifest Mailing System
This publication provides information on the Manifest Mailing System, which automates the documentation of postage and fees for all pieces in a mailing paid via permit imprint indicia.
08/25/2025