Announcements
10/09/2026
DELIVERY - Southern Area -AL-MS District - 3-Digit Zip Code Areas 365, 366, & 395 Temporarily Suspended
Announcements
10/09/2026
INFORMATIONAL - Commercial System Releases (COP 2.5.9, LBRO 20.0.93)
Announcements
10/09/2026
INFORMATIONAL - Hurricane Isaias – Gulf Region of U.S. – Facility Closures
Announcements
10/09/2026
INFORMATIONAL - PO! Alert - October 18, 2026
Release Notes
10/09/2026
October 18 2026 PO! 64.1.2.0 Release Notes
Release Notes
10/09/2026
October 15 2026 COP 2.5.9 Release Notes
Release Notes
10/09/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

Announcements
10/08/2026
DELIVERY - Crucible Post Office (15325) - Suspended Temporarily
Announcements
10/08/2026
INFORMATIONAL - Scheduled Maintenance for October 17, 2026 – Possible Disruption with USPS Payments API
Contact Lists
10/08/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
10/08/2026
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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10/08/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
10/08/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
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10/08/2026
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
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10/08/2026
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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10/08/2026
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
10/08/2026
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)