Announcements
08/13/2026
PROCESSING AND DISTRIBUTION - Update - Central Region – Upper Midwest and Ohio Valley- Severe Weather Impacts
Announcements
08/13/2026
INFORMATIONAL - Cancellation of Daily Addressing and NCOA + Webinars
Announcements
08/13/2026
DELIVERY - WestPac Area - Washington District - Mead and Nine Mile Falls Post Offices – Resume Operations
Announcements
08/13/2026
PROCESSING AND DISTRIBUTION - Central Region – Upper Midwest and Ohio Valley- Severe Weather Impacts
Fact Sheets
08/13/2026
Addresses API - Tech Sheet
Error Codes
08/13/2026
Known Issues List 8.6.2026
Contact Lists
08/13/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
08/13/2026
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
08/13/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
08/13/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)