Release Notes
12/12/2025
ID API Release Notes Release V1.0
Technical Specifications
12/12/2025
Informed Delivery API Technical Specifications V1.0_5.0
Announcements
12/11/2025
DELIVERY - WestPac - Washington District Snoqualmie Post Office - Temporarily Closed
Announcements
12/11/2025
INFORMATIONAL - Logistics and Infrastructure Organizations
Announcements
12/11/2025
INFORMATIONAL- Update - Plant-Verified Drop Shipment Updates
Announcements
12/11/2025
PROCESSING AND DISTRIBUTION - Volume Delays at Louisville KY PDC 12-10-2025
FAQs
12/11/2025
USPS PTR2 API Known Issues
Contact Lists
12/11/2025
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
12/11/2025
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
12/11/2025
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)