Release Notes
03/06/2026
PTR2 Release Notes_DD_03_07_26
Announcements
03/06/2026
INFORMATIONAL- 2026 National Postal Forum - Workshop Schedule Is Available Online
FAQs
03/06/2026
USPS PTR2 API Known Issues
Announcements
03/05/2026
INFORMATIONAL - End of USPS Web Tools Tracking 3.5.26
Contact Lists
03/05/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
03/05/2026
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
03/05/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
03/05/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
03/05/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
Contact Lists
03/05/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)