Data Files
09/03/2026
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
09/02/2026
INFORMATIONAL - Western Region - Beaumont, TX – Tropical Storm Edouard Impacts
Contact Lists
09/02/2026
Mailers Technical Advisory Committee (MTAC) Membership Roster and Vacancies
Release Notes
09/02/2026
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Announcements
09/01/2026
INFORMATIONAL - UPDATE - Elevate Your Marketing Strategy with USPS 2027 Mailing Promotions Kickoff Webinar
Data Files
09/01/2026
August 2026 Nixie Volume

This spreadsheet contains the UAA statistics for August 2026.

Error Codes
09/01/2026
Known Issues List 8.27.2026
Contact Lists
09/01/2026
MPE (Mail Processing Equipment) Service Provider Licensees

Marketing contact information for certified Mail Processing Equipment (MPE) licensees 

Publications
08/31/2026
PCC Insider August 2026 Edition
Announcements
08/31/2026
INFORMATIONAL: Mail Spoken Here - August 2026