Announcements
04/17/2026
INFORMATIONAL: PostalOne! – [INCIDENT # 10576848] Error for Mail Entry Invoice Transaction Requests
Announcements
04/17/2026
INFORMATIONAL - Officer Announcement - Pete Routsolias
Release Notes
04/17/2026
April 26 2026 Release Notes
Announcements
04/17/2026
INFORMATIONAL - Connect with USPS Experts at the 2026 National Postal Forum Consultation Center
Announcements
04/17/2026
INFORMATIONAL - Executive Retirement - Dr. Joshua D. Colin
Announcements
04/17/2026
INFORMATIONAL - Forge Bold Horizons at NPF 2026 Peer-to-Peer Session
Announcements
04/17/2026
INFORMATIONAL - REMINDER - July 2026 Market Dominant Price Change Filing Webinar - TODAY - Friday, April 17, 2026
Release Notes
04/17/2026
PTR2 Release Notes_DD_04_18_26
Release Notes
04/17/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

Presentations
04/16/2026
PCCAC: News You Need to Know From MTAC- April 2026

 

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Announcements
04/16/2026
DELIVERY -International Service Resumption of Mail Service to Qatar - Effective April 17, 2026
Announcements
04/16/2026
DELIVERY - West Meridian Post Office (39307) - Suspended Temporarily
Error Codes
04/16/2026
Known Issues List 4.14.2026
Release Notes
04/16/2026
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Contact Lists
04/16/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)