Presentations
08/29/2025
USPS Ship Disputes and Refunds: Unused Labels Refund Request
Presentations
08/29/2025
USPS Ship Disputes and Refunds: Joint Review
Release Notes
08/29/2025
August 31 2025 Release Notes
Announcements
08/28/2025
PROCESSING AND DISTRIBUTION - Normal Operations Have Resumed in the Chicago, IL RPDC
Release Notes
08/28/2025
USPS APIs Release Notes

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

Contact Lists
08/28/2025
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
08/28/2025
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
08/28/2025
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
08/28/2025
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
08/28/2025
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)