Data Files
04/30/2026
Z4 Info File

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

Data Files
04/30/2026
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
04/29/2026
INFORMATIONAL - USPS APIs System Release - Rescheduled April 30, 2026
Announcements
04/29/2026
INFORMATIONAL - USPS Modernization Through Package Equipment Upgrades in May 2026
Announcements
04/29/2026
INFORMATIONAL - Unlock the Power of Mail Insights - The United States Postal Service’s Household Mail Survey
Announcements
04/29/2026
DELIVERY - International Service Resumption Notice – May 1, 2026
Announcements
04/29/2026
INFORMATIONAL - Executive Retirement - Randy Workman
Data Files
04/29/2026
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.

Release Notes
04/29/2026
USPS APIs Release Notes

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

Release Notes
04/29/2026
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.