Labeling Lists Technical Guide

The Labeling Lists data product assists mailers with presorting mail. It provides active, originating 3- and 5-digit ZIP Code™ data along with their destination locations [including city/state/ZIP Code] for labeling purposes. The product contains complete data files of each list found online via Postal Explorer® at https://pe.usps.com. Updates to the Labeling Lists are also published in the Postal Bulletin.

ACS™ Electronic Product Fulfillment (EPF) Fulfillment File Access

Learn the different methods of accessing your ACS™ files from EPF.

Current Mail Growth Incentive- Requesting Postage Credit on a Permit

PostalOne! Release 61.0.0.0 Mail.XML PROD WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ PROD Release 61.0.0.0

PostalOne! Release 61.0.0.0 Mail.XML TEM WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ TEM Release 61.0.0.0

PostalOne! Release 61.0.0.0 Mail.XML PrePROD WSDLs

PostalOne! Release 61.0.0.0 Mail.XML CAT WSDLs

Mail.dat Technical Specifications R61.0.0.0 V2

Mail.XML Technical Specifications R61.0.0.0 V1

MASS™ Technical Guide for Cycle O

This document provides a technical guide for MASS™ Cycle O. MASS™ is an extension of the CASS™ system.