Contact Lists
10/22/2026
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
Contact Lists
10/22/2026
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
10/22/2026
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
10/22/2026
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
10/22/2026
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
10/22/2026
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
10/22/2026
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.

Fact Sheets
10/22/2026
Intelligent Mail® for Small Business (IMsb) Fact Sheet

This fact sheet contains an overview of the IMsb Tool, its benefits, and how it works.

Announcements
10/21/2026
DELIVERY - UPDATE - Akron Post Office (35441) Suspended Temporarily
Announcements
10/21/2026
INFORMATIONAL - European Union Requirements for Product Identifiers Effective November 1, 2026