Release Notes
02/17/2026
February 26 2026 Release Notes
Announcements
02/13/2026
INFORMATIONAL - Commercial System Releases – February 26, 2026
Announcements
02/13/2026
INFORMATIONAL - Commercial System Releases – February 15, 2026
Data Files
02/13/2026
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. Please note that items in bold text were updated or added recently.

Announcements
02/12/2026
INFORMATIONAL - Professional Certifications Opportunities at NPF 2026
Fact Sheets
02/12/2026
Manifest Mailing Systems Retirement Fact Sheet

The USPS is amending Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM) subsection 703.2.0 to retire the manifest mailing system (MMS). Effective April 1, 2026.

Contact Lists
02/12/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
02/12/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

Contact Lists
02/12/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
02/12/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)