Contact Lists
01/09/2025
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.

Data Files
01/09/2025
Z4 Info File

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

Data Files
01/09/2025
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
01/08/2025
DELIVERY - CA-4 District - Altadena and La Canada Flintridge Post Offices Temporarily Closed
Announcements
01/08/2025
INFORMATIONAL - FedEx Lives Embargo - Thursday 1-9-25 and Friday 1-10-25
Presentations
01/08/2025
USPS Ship Webinar Census and Monthly Assessments Slides 01/08/25
Program Requirements
01/08/2025
Informed Delivery Triggers OPS Codes
Announcements
01/08/2025
DELIVERY: NOTIFICATION - Resumption of Mail Service (Cuba and Vanuatu) - Effective January 10, 2025
Announcements
01/07/2025
INFORMATIONAL: Postal Service Commitment to Open Communication Amid Strategic Realignments
Announcements
01/06/2025
INFORMATIONAL: The Postal Service: Delivering More in 2025