Announcements
01/23/2026
DELIVERY - Winter Storm Fern – Operations Weather Advisory
Release Notes
01/23/2026
February 1 2026 Release Notes
Announcements
01/22/2026
DELIVERY - Priority Mail Express Service Guarantee Suspension During Winter Weather Impacts
Announcements
01/22/2026
INFORMATIONAL - Winter Storm Fern - Embargo for Lives
Announcements
01/22/2026
INFORMATIONAL - Commercial Systems Releases February 1, 2026
Announcements
01/22/2026
INFORMATIONAL - Commercial System Releases – January 25, 2026
Contact Lists
01/22/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
01/22/2026
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
01/22/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
01/22/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)