Announcements
04/02/2026
INFORMATIONAL -Upcoming USPS.com Maintenance CANCELLED
Announcements
04/02/2026
DELIVERY Resumption of Mail Service to Lebanon- Effective April 3, 2026
Publications
04/02/2026
PCC Events (April 2026)
Data Files
04/02/2026
Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q2 FY26)

ACS Nixie stats by industry for FY26 Q2.

Publications
04/02/2026
Destination Entry Service Standard Directory
Publications
04/02/2026
Combined Service Standard Directory-PRI
Publications
04/02/2026
Supplemental Service Standard Directory-PRI
Publications
04/02/2026
Supplemental Service Standard Directory-PKG
Publications
04/02/2026
Supplemental Service Standard Directory-PFC
Publications
04/02/2026
Supplemental Service Standard Directory-PER
Publications
04/02/2026
Supplemental Service Standard Directory-MKT
Publications
04/02/2026
Supplemental Service Standard Directory-GAL
Publications
04/02/2026
Supplemental Service Standard Directory-GAH
Publications
04/02/2026
Supplemental Service Standard Directory-FCM
Publications
04/02/2026
Combined Service Standard Directory-GAL
Publications
04/02/2026
Combined Service Standard Directory-PKG
Publications
04/02/2026
Combined Service Standard Directory-PFC
Publications
04/02/2026
Combined Service Standard Directory-PER
Publications
04/02/2026
Combined Service Standard Directory-MKT
Publications
04/02/2026
Combined Service Standard Directory-GAH
Publications
04/02/2026
Combined Service Standard Directory-FCM
Publications
04/02/2026
3D Base Service Standard Directory
Contact Lists
04/02/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
04/02/2026
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
04/02/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)