Contact Lists
09/18/2025
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
09/18/2025
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
09/18/2025
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

Data Files
09/18/2025
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

Data Files
09/18/2025
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

 

Announcements
09/17/2025
INFORMATIONAL - Scheduled Commercial Systems Activities - 9.21.2025
Announcements
09/17/2025
INFORMATIONAL - Scheduled Commercial Systems Activities - Time Limited Price Change Release 2025 - 9.21.2025
Announcements
09/17/2025
INFORMATIONAL - USPS Recommends 2025 Holiday Mailing and Shipping Dates
Announcements
09/17/2025
2026 NPF Registration Now Open
Announcements
09/17/2025
INFORMATIONAL- Southern Area Virtual AIM Meeting | Registration is still open!