Release Notes
01/23/2026
February 1 2026 Release Notes
Release Notes
01/20/2026
01_20_25_PTR2 Release Notes
Release Notes
01/18/2026
January 18 2026 Release Notes
Release Notes
01/16/2026
January 22 2026 Release Notes
Release Notes
01/14/2026
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
01/07/2026
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.

Release Notes
01/04/2026
January 4 2026 Release Notes
Release Notes
12/22/2025
12_22_25_PTR2 Release Notes
Release Notes
12/12/2025
ID API Release Notes Release V1.0