Announcements
09/03/2026
INFORMATIONAL - USPS APIs System Deployment – September 13, 2026
Announcements
09/03/2026
INFORMATIONAL - USPS APIs System Deployment [CR# TBD] – September 12, 2026
Announcements
09/03/2026
INFORMATIONAL - USPS APIs System Deployment – September 6, 2026
Announcements
09/03/2026
PROCESSING AND DISTRIBUTION - USPS Modernization Through Package Equipment Upgrades in September 2026
Announcements
09/03/2026
PROCESSING AND DISTRIBUTION - Update - Western Region - Beaumont, TX - Tropical Storm Edouard Impacts
User Guides
09/03/2026
Provisioning EMAS API Invoices Data in Informed Visibility® Mail Tracking & Reporting (IV®-MTR)

This guide provides instructions for receiving EMAS API Invoices data through the IV Mail Tracking & Reporting application.

Technical Specifications
09/03/2026
National Change of Address - API
FAQs
09/03/2026
USPS PTR2 API Known Issues
Contact Lists
09/03/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
09/03/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.