AIS Copyright/License Agreement

Delivery Unit Summary Form

The Delivery Unit Summary form must be completed in its entirety in order to request DMM^® 507.8 Service.

Address Information System (AIS) Products Pricing

Pricing guide for Address Information System (AIS) products, including Carrier Route, ZIP + 4^®, Five-Digit ZIP^®, City State, Delivery Statistics, Z4Change, ZIPMove, eLOT^®, and RDI™.

Address Information Systems (AIS) Products Order Form

Order form for Address Information System (AIS) products.

Address Element Correction (AEC) and AEC II Processing Request Form for Vendors

Vendor processing request form for AEC and AEC II.

Address Element Correction (AEC) & AEC II Processing Request Form

Processing form for AEC and AEC II products.

INFORMATIONAL: Guidance for Files with ADC/AADC Container and Rate Categories Entered after July 12

INFORMATIONAL - REMINDER - Commercial System Releases – Week of July 11, 2026

INFORMATIONAL - Commercial System Releases – Week of July 18, 2026

INFORMATIONAL - Executive Appointment - James Duffy

PTR2 Release Notes_DD_07_11_26

Informed Visibility Mail Tracking & Reporting Machine Count

List of US Postal Service machines by site, including a description of each machine.

Power Up Your Public Speaking with Chris Lien

July 9, 2026

https://usps.zoomgov.com/rec/share/1SzAjIjmYy__k2JW7bhV0TFl00lkeL0wdLa21M2qTmE83T7zgkEnvyohUx18yqxE.DkherpWO6nKL7X0v

Passcode: RjWfH6%*

INFORMATIONAL - POSTPONED – Addresses API 3.2.3 Access Postponed Until August 1, 2026

Earn a Free Mailing and Shipping Certification from the PCCAC

2027 Add-Ons

2027 Add-Ons

2027 Impact Messaging Promotion

2027 Direct Mail Discovery Promotion

2027 First-Class Mail Advertising Promotion

2027 Integrated Technology Promotion

GUIDEBOOK COMING SOON 

2027 Tactile, Sensory & Interactive Promotion

INFORMATIONAL - USPS Local XChange

PTR2 Release Notes_DD_07_01_26

Addresses API - Tech Sheet

USPS APIs Release Notes

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

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)

DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)

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.

Z4 Info File

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

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.

INFORMATIONAL - Upcoming USPS.com Maintenance July 11th Cancelled

2026 Promotions FAQ

PROCESSING AND DISTRIBUTION - Central Region - Saint Louis, MO - Weather Related Impacts