Featured Updates
02/11/2025
11/13/2024
12/09/2024
Publication for Streamlined Mail Acceptance for Letters and Flats (Pub 685)
Streamlined Mail Acceptance for Letters and Flats (Pub 685) contains the policies and processes for the verification of eligible business mailings using tools provided by Intelligent Mail® Full-Service, eInduction, and Seamless Acceptance.
06/21/2024
08/28/2024
First-Class Mail and Marketing Mail Growth Incentives FAQs
On September 27, 2023, the Postal Regulatory Commission (PRC) approved the Postal Service request to make Mail Classification Schedule (MCS) changes to establish two distinct Mail growth incentives — a First Class Mail Growth Incentive and a Marketing Mail Growth Incentive.
Latest Updates
04/04/2025
04/03/2025
Z4 Info File
A downloadable ZIP file containing information related to the Z4 Info File
04/03/2025
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.
04/03/2025
04/03/2025
PostalOne! Contingency Plan
Learn what to do in the event a system outage prevents you from submitting your mailing information electronically.
USPS Service Alerts
Receive near real-time notifications about postal facility service disruptions due to weather-related outages and other natural disasters or events.
Stay Informed About Postal Policy
Updated daily, the Federal Register Notices offer detailed information regarding official USPS policy and regulatory changes.
Intelligent Mail: Featured Resources
Publication for Streamlined Mail Acceptance for Letters and Flats (Pub 685)
Streamlined Mail Acceptance for Letters and Flats (Pub 685) contains the policies and processes for the verification of eligible business mailings using tools provided by Intelligent Mail® Full-Service, eInduction, and Seamless Acceptance.