Publications
10/30/2026
PCC Insider October 2026 Special PCC Week Edition
Announcements
10/30/2026
INFORMATIONAL - Commercial System Releases – November 3, November 10, and November 12, 2026
Announcements
10/30/2026
INFORMATIONAL - Legacy Tracking API Retirement + Scan Event Extract Modernization
Release Notes
10/30/2026
November 12 2026 COP 2.5.9 Release Notes

Coming soon

Announcements
10/29/2026
NPF Call for Presentations Closing 10/30/2026
Announcements
10/29/2026
INFORMATIONAL - PostalOne! System – Issues with Promotion Removal and Auto-Finalized Postal Wizard Statements
Announcements
10/29/2026
INFORMATIONAL - NPF 2027 Call for Presentations is closing on Friday, October 30th
Program Requirements
10/29/2026
2026 Promotions FAQ
Release Notes
10/29/2026
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Contact Lists
10/29/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
10/29/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

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10/29/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
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10/29/2026
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
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10/29/2026
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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10/29/2026
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
10/29/2026
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)