Contact Lists
06/18/2026
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
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
06/18/2026
Z4 Info File

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

Data Files
06/18/2026
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
06/17/2026
INFORMATIONAL: USPS APIs System Release Notification - June 24, 2026
Announcements
06/17/2026
INFORMATIONAL: USPS APIs Systeme Release Notification - June 24, 2026
Announcements
06/17/2026
DELIVERY - Resumption of Mail Service to Niue - Effective June 22, 2026
Announcements
06/17/2026
INFORMATIONAL - Postal Service Prepares for Championship Celebration Parades
Announcements
06/17/2026
INFORMATIONAL - Retirement of USPS Tracking v3.0 and Tracking Webhook Subscriptions v3.0 APIs
Presentations
06/16/2026
PCC National Monthly Touchpoint (June)

 

 

PCC National Monthly Touchpoint (June)

Passcode: k8tv2jE+

Announcements
06/16/2026
INFORMATIONAL - Plant-Verified Drop Shipment Updates for July 12, 2026 Price Change
Announcements
06/16/2026
PCC Week Speaker Request Survey
Release Notes
06/16/2026
PTR2 Release Notes_DD_06_16_26
Announcements
06/16/2026
DELIVERY - Rillito Post Office (85654) - Temporarily Closed
Announcements
06/16/2026
INFORMATIONAL - USPS Webinar - AI-Powered Omnichannel Performance TODAY June 16, 2026
Data Files
06/16/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Development Tracker

This document provides a list of active IV-MTR work to be as well as items completed in FY25.

 

*Please note, Postal Pro is the only source for a current IV-MTR Development log as updates will be made on an ongoing basis.

Error Codes
06/15/2026
Known Issues List 6.11.2026
Data Files
06/15/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
06/15/2026
City/State ZIP Code Weekly Compare
Data Files
06/15/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
06/15/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
06/15/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
06/15/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
06/15/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
06/15/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)