Release Notes
11/26/2025
January 4 2026 Release Notes
Program Requirements
11/26/2025
INFORMATIONAL - International Suspension of Mail Service - Effective November 28, 2025
Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML TEM WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ TEM Release 63.0.0.0

Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML PrePROD WSDLs
Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML PROD WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ PROD Release 63.0.0.0

Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML CAT WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ CAT Release 63.0.0.0

Contact Lists
11/26/2025
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
11/26/2025
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
11/26/2025
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
11/26/2025
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)