Announcements
02/06/2026
INFORMATIONAL - USPS APIs System Deployment February 7, 2026
Announcements
02/06/2026
INFORMATIONAL - Commercial System Releases - February 25 2026
Announcements
02/06/2026
INFORMATIONAL - MAILER ID (MID) Validation for Payments POSTPONED
Announcements
02/06/2026
Deadline Extension 2026 NPF Ticket Contest
Release Notes
02/06/2026
Informed Delivery API Release Notes V1.2
Data Files
02/06/2026
Informed Visibility Mail Tracking & Reporting Machine Count

List of US Postal Service machines by site, including a description of each machine.

Data Files
02/06/2026
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.

Data Files
02/06/2026
USPS Ship Data Dictionary

Detailed information on the USPS Ship (Formerly Package Platform) data elements available through the Informed Visibility Mail Tracking & Reporting (IV-MTR) application.

Contact Lists
02/05/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
02/05/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.