Announcements
05/20/2026
DELIVERY - Diplomatic Post Office (DPO) May 20, 2026
Announcements
05/20/2026
INFORMATIONAL - USPS APIs System Release May 21, 2026
Technical Specifications
05/20/2026
Mail.xml Technical Specifications R64.0.0.0
Technical Specifications
05/20/2026
Mail.dat Technical Specifications R64.0.0.0
Release Notes
05/20/2026
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. 

Announcements
05/19/2026
INFORMATIONAL - Mailer Scorecard - Temporarily Unavailable
Announcements
05/19/2026
INFORMATIONAL - Updated - 2026 Labeling List and Mail Direction File (MDF) Timeline
Release Notes
05/19/2026
PTR2 Release Notes_DD_05_19_26
Data Files
05/19/2026
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.

Release Notes
05/18/2026
May 31 2026 EPS/eBill R8.4.0.0 Release Notes
Fact Sheets
05/18/2026
IMpb (Intelligent Mail® Package Barcode & IMmb (Intelligent Mail® Matrix Barcode) Verification Fact Sheet
Announcements
05/18/2026
DELIVERY - International Service Resumption Notice – Effective May 19, 2026
Announcements
05/18/2026
INFORMATIONAL - USPS APIs System Release - Rescheduled May 28, 2026
Announcements
05/18/2026
INFORMATIONAL - USPS APIs System Release May 26, 2026
Data Files
05/18/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
05/18/2026
City/State ZIP Code Weekly Compare
Data Files
05/18/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
05/18/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
05/18/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
05/18/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Data Files
05/18/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
05/18/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
05/18/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
05/18/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
05/18/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)