Announcements
02/19/2026
INFORMATIONAL - 2026 Southern Area AIM Meeting - Orlando, Florida
Data Files
02/19/2026
Z4 Info File

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

Data Files
02/19/2026
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.

 

Announcements
02/18/2026
INFORMATIONAL - Pub 401 and Manifest Mailing System (MMS) Retirement
Release Notes
02/18/2026
February 25 2026 Release Notes
Announcements
02/17/2026
INFORMATIONAL: Commercial System Releases - February 22, 2026
Announcements
02/17/2026
INFORMATIONAL: USPS APIs System Maintenance - February 25, 2026
Release Notes
02/17/2026
February 26 2026 Release Notes
Data Files
02/17/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
02/17/2026
Undeliverable-as-Addressed (UAA) Mail Roll-Up 1998-2025

This spreadsheet provides a breakdown of Total UAA mail by mail class from FY1998 thru FY2025.