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.

INFORMATIONAL - FAA Nationwide Ground Stoppage - November 13, 2026

INFORMATIONAL - USPS APIs System Maintenance Notification November 14

INFORMATIONAL: International Service Suspension Notice - Effective November 14, 2026

PTR1 Release Notes_DD_11_14_26

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 the current fiscal year.

*Please note, Postal Pro is the only source for a current IV-MTR Development log as updates will be made on an ongoing basis.

Business Acceptance Solutions & Major Mailer Support Directory

This document provides a contact list for Business Acceptance Solutions (formerly Business Mailer Support) & Major Mailer Support

INFORMATIONAL: U.S. Postal Service Recommends Shipping Price Adjustments for 2027

INFORMATIONAL: U.S. Postal Service Recommends Shipping Price Adjustments for 2027

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

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

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)

DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)

CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Piece-Level One-Time Query Request

This form is to help users prepare to submit a one-time query for piece-level data, either on their own through the IV-MTR web application or assistance from the IV Solutions Center.

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Operation Codes List

This spreadsheet provides a list of operation codes (opcodes), also known as Scan Event Codes, for the IV-MTR application.

Z4 Info File

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

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.

New National Industry AIM Co-Chair – Alexis Nicoletta

INFORMATIONAL - UPDATE - Discontinuance of USPS Tracking Labels (888, 889, 891, 892)

INFORMATIONAL - New National Industry AIM Co-Chair - Alexis Nicoletta

INFORMATIONAL - Zoom Technical Difficulty - FY2027 Peak Season Network Update Webinars Begin Nov 12

PTR2 Release Notes_DD_11_14_26

PFSC Application 3.0 Release Notes 11-10-2026

PFSC Release Notes for the enhancement release on 11/10/2026.

November 12 2026 COP 2.5.9 Release Notes

Premium Forwarding Service Commercial External User Guide

User Guide for the Premium Forwarding Service Commercial application. 

Mailer Identifier (MID) Exception Process

The Postal Service will issue a Mailer Identifier (MID) to a mailer for use in the Intelligent Mail® container barcode, Intelligent Mail® tray barcode, Intelligent Mail® barcode or Intelligent Mail® package barcode. The MID is a field within the Intelligent Mail barcodes and is used to identify the mailer.

INFORMATIONAL - REMINDER - FY2027 Peak Season Network Update Webinars Begin

News You Need to Know from MTAC - October 2026

Informed Visibility Mail Tracking & Reporting Machine Count

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

***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

City/State ZIP Code Weekly Compare

3 Digit ZIP/AISU Office List (AISUREPT.TXT)

Cumulative Listing of ZIP Codes Covered by the LACS Database

This document provides a cumulative listing of ZIP Codes covered by the LACS database for LACS^Link®.

AIS Congressional District File (CONG_DIST.TXT)

AIS County Name Table Layout (AISCNTY.TXT)