Announcements
11/22/2024
INFORMATIONAL: PostalOne! System - Promotions - Update
Announcements
11/22/2024
UPDATE - DELIVERY: Atlantic Area - Virginia District - Bowling Green Post Office (22427) - Temporarily Closed
Announcements
11/22/2024
UPDATE - DELIVERY: Atlantic Area North Carolina District
Release Notes
11/22/2024
USPS APIs Release Notes

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

Data Files
11/22/2024
Intelligent Mail Small Business (IMsb) Tool Industry Session Recording

This industry presentation provides an overview of the Intelligent Mail® for Small Business Tool for new users.

Contact Lists
11/21/2024
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
11/21/2024
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

Contact Lists
11/21/2024
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
11/21/2024
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
11/21/2024
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)