Data Files
08/13/2026
Z4 Info File

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

Data Files
08/13/2026
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
08/12/2026
INFORMATIONAL - USPS APIs System Release Notification – August 31, 2026
Announcements
08/12/2026
DELIVERY - La Villa Post Office (78562) - Temporarily Suspended
Announcements
08/12/2026
DELIVERY: WestPac Area - NV-UT District - Nixon Post Office (89424) - Office Temporarily Closed
Applications/ Forms
08/12/2026
Request to Lead or Participate - MTAC User Group and Work Group
FAQs
08/12/2026
USPS PTR2 API Known Issues
  • 08/12/2026

    Mailers Technical Advisory Committee (MTAC) Membership Roster and Vacancies

    • Data Files
    08/12/2026
    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
    08/12/2026
    USPS APIs Release Notes

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