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04/23/2026

CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)

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04/23/2026

DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

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04/23/2026

DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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04/23/2026

DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

Contact Lists
04/23/2026

CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

Contact Lists
04/23/2026

CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)

Contact Lists
04/23/2026

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.

Data Files
04/23/2026

Z4 Info File

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

Data Files
04/23/2026

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
04/22/2026

INFORMATIONAL - Postal Service Updates for May and June 2026 - SDC Activations

Announcements
04/22/2026

DELIVERY - Diplomatic Post Office (09291) to resume Mailing Services

Announcements
04/21/2026

INFORMATIONAL - July 2026 Market Dominant Price Change Filing Webinar Posted to PostalPro

Presentations
04/21/2026

July 2026 Market Dominant Price Change Filing Webinar

Overview of July 2026 Market Dominant Price Change.

If you missed the session—or would like to revisit this informative presentation—you can access both the presentation slides and the full webinar recording at the link below:

To view Webinar click here:

Passcode: WQ!!7t=8

Announcements
04/20/2026