Release Notes
01/09/2026
USPS APIs Release Notes

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

Release Notes
01/08/2026
July 2026 Release Overview

Note: For the latest technical specifications, please see the July 2026 Price Change Release Notes as they are published. Mail.dat and Mail.XML updates required for this release. 

Release Notes
01/04/2026
January 4 2026 Release Notes
Release Notes
12/12/2025
ID API Release Notes Release V1.0
Release Notes
12/08/2025
Tracking API Access Control Changes Release Overview
Release Notes
11/16/2025
November 16 2025 Release Notes
Release Notes
11/06/2025
November 6 2025 Release Notes
Release Notes
10/20/2025
January 2026 Release Overview
Release Notes
10/19/2025
October 19 2025 Release Notes
Release Notes
10/06/2025
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.