Data Files
09/24/2026
Z4 Info File

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

Data Files
09/24/2026
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
09/23/2026
DELIVERY - International Suspension of Mail Service - Effective September 25, 2026
Announcements
09/22/2026
Update - Central Processing Region - Louisville, KY Processing and Processing and Distribution Center (P&DC)
Announcements
09/22/2026
DELIVERY - Atlantic Area – Maryland District - Hughesville Post Office (20637) - Temporarily Closed
Announcements
09/22/2026
INFORMATIONAL - Commercial System Releases September 24 & 29, 2026
Contact Lists
09/22/2026
Mailers Technical Advisory Committee (MTAC) Membership Roster and Vacancies
Announcements
09/21/2026
INFORMATIONAL - USPS APIs System Release Notification – September 24, 2026
Data Files
09/21/2026
2027 Labeling List and Mail Direction File Schedule

This is the Labeling Lists production schedule for 2027.

Announcements
09/21/2026
DELIVERY - PostalOne! System - Issue with Finalizing Parcel Mailings and Application of IMpb Noncompliance