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Announcements
10/16/2026

DELIVERY - Southern Area -Texas 2 District - Matagorda Post Office (77457) Resuming Operations

Announcements
10/16/2026

Step Into Leadership: Apply Now for the USPS National AIM Industry

Announcements
10/16/2026

INFORMATIONAL - Commercial System Releases – Week of October 24, 2026

Release Notes
10/16/2026

PTR1 Release Notes_DD_10_17_26

Announcements
10/16/2026

INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11118454 Extended Processing Times for Large Mail.XML Mailings

10/16/2026

October 25 2026 EPS 8.8.0.0 Release Notes

Coming Soon

Announcements
10/15/2026

INFORMATIONAL - New Commercial Organization

Announcements
10/15/2026

INFORMATIONAL - Chief Processing & Distribution Office Reorganization

Announcements
10/15/2026

INFORMATIONAL - USPS APIs System Release Notification – October 15, 2026

Announcements
10/15/2026

INFORMATIONAL - USPS APIs System Release Notification October 28, 2026

Announcements
10/15/2026

DELIVERY - Southern Area - FL1 District - 3 Digit Zip Code Area 324 & 325 All Operations Restored

Applications/ Forms
10/15/2026

PCCAC Candidate Application 9.28.2026

Contact Lists
10/15/2026

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

Contact Lists
10/15/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

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10/15/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

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10/15/2026

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

Contact Lists
10/15/2026

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

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DELIVERY - Southern Area -Texas 2 District - Matagorda Post Office (77457) Resuming Operations

Step Into Leadership: Apply Now for the USPS National AIM Industry

INFORMATIONAL - Commercial System Releases – Week of October 24, 2026

PTR1 Release Notes_DD_10_17_26

INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11118454 Extended Processing Times for Large Mail.XML Mailings

October 25 2026 EPS 8.8.0.0 Release Notes

INFORMATIONAL - New Commercial Organization

INFORMATIONAL - Chief Processing & Distribution Office Reorganization

INFORMATIONAL - USPS APIs System Release Notification – October 15, 2026

INFORMATIONAL - USPS APIs System Release Notification October 28, 2026

DELIVERY - Southern Area - FL1 District - 3 Digit Zip Code Area 324 & 325 All Operations Restored

PCCAC Candidate Application 9.28.2026

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

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

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