2026 Promotions Calendar and Technical Guide

Guide to USPS Ship

USPS Ship Tech Sheet

USPS Ship is a modernized platform enabling commercial package payment, verification, and end-to-end visibility for a wide array of domestic and international products.

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.

PostalOne! Release 63.0.0.0 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 63.0.0.0

PostalOne! Release 63.0.0.0 Mail.XML PrePROD WSDLs

PostalOne! Release 63.0.0.0 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 63.0.0.0

PostalOne! Release 63.0.0.0 Mail.XML CAT WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ CAT Release 63.0.0.0

Dimensioned Layouts for the Container Barcode Formats

Intelligent Mail Container Barcode Technical Specifications

Technical specifications for printing the USPS Intelligent Mail® Container barcode (IM™ Container barcode). The Intelligent Mail Container barcode is used on mailer-generated pallet labels to uniquely identify pallets and similar containers (i.e. All Purpose Containers, hampers, pallet boxes, etc.) in addition to identifying the mail owner.

Premium Forwarding Service Commercial External User Guide

Intelligent Mail Tray Label Technical Fact Sheet

This document provides fact sheet providing technical specifications on the acquisition, implementation, and benefits of the Intelligent Mail Tray Label.

PostalOne! Release 62.0.0.0 Mail.XML CAT WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ CAT Release 62.0.0.0

PostalOne! Release 62.0.0.0 Mail.XML PrePROD WSDLs

PostalOne! Release 62.0.0.0 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 62.0.0.0

PostalOne! Release 62.0.0.0 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 62.0.0.0

Informed Delivery Mail.XML Mailer Guide

This is a guide for submitting campaigns to PostalOne! via Mail.XML electronic documentation (eDoc).

Informed Delivery Mail.dat Mailer Guide

This is a mailer guide for creating campaigns via PostalOne! through Mail.dat eDoc submission.

eVS to USPS Ship Migration Tech Sheet

The Postal Service is retiring the electronic verification system (eVS). eVS customers must migrate to USPS Ship or USPS APIs by February 2025. This includes customers using Premium Forwarding Services Commercial (PFSC) and Click N Ship BusinessPro (CNBPro). This document outlines the differences between the two platforms and steps to migrate from eVS to USPS Ship.

Guide to USPS Ship for eVS Shippers

Secure Destruction Technical Guide

A technical reference for implementing the Secure Destruction process

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.

Business Customer Gateway: Overview and Tour

This presentation provides an overview of the Business Customer Gateway and a tour for new users. 

Publication 205 Electronic Verification System (eVS®) Business and Technical Guide

API Tech Sheet

The USPS API Platform provides a dynamic, one-stop-shop of shipping capabilities to expand business reach
and increase efficiency. The USPS suite of APIs enables integrators to standardize an address, price a
package, create a label, find a USPS acceptance facility, schedule a carrier pick-up, and track a package from
entry to delivery. The USPS API platform also offers webhooks for near-real-time push notifications for tracking
events.

Zone Charts Matrix Technical Guide (Effective - June 2024)

This guide details technical information about the National Zone Charts Matrix. A few topics in this guide include Defining a Zone, Matrix File General Information, and Matrix Zone Determination.

PostalOne! Release 60.0.0.0 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 60.0.0.0

PostalOne! Release 60.0.0.0 Mail.XML PrePROD WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ PrePROD Release 60.0.0.0

PostalOne! Release 60.0.0.0 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 60.0.0.0

PostalOne! Release 60.0.0.0 Mail.XML CAT WSDLs

ACS™ Electronic Product Fulfillment (EPF) Download Manager Technical Guide

Documentation for the Client Side ACS™ EPF Download Manager software package.

CASS™ Technical Guide for Cycle O

This document provides a technical guide for the CASS™ product. The CASS certification process is designed in cooperation with the mailing industry to improve the accuracy and deliverability of addresses for mail qualifying for postal discounts.

Intelligent Mail® Package Barcode (IMpb) ACS™ Technical Guide

Technical guide for users of Intelligent Mail® Package Barcode (IMpb) Address Change Services (ACS). Includes a solution overview, features, participation requirements, and service endorsement options.

Traditional ACS™ with Shipper Paid Services Technical Guide

This document is a guide that provides technical information about Traditional ACS™ with shipper paid services.

Informed Delivery API Technical Specifications v4.2.3

Technical Specs are based on v4.2.0 of the XML schemas.

This is the Technical Specifications guide for the Informed Delivery API - Release 4.3 on 3/30/2023

12-21-23 - New version to fix a few minor typos.

PostalOne! Release 59.0.0.0 Mail.XML PrePROD WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ PrePROD Release 59.0.0.0

PostalOne! Release 59.0.0.0 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 59.0.0.0

PostalOne! Release 59.0.0.0 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 59.0.0.0

PostalOne! Release 59.0.0.0 Mail.XML CAT WSDLs

Informed Delivery Saturation Campaign Mailer Guide

This guide outlines the requirements for participating in and submitting Saturation Campaigns via PostalOne! eDoc (Mail.dat) during the Informed Delivery Promotion. 

For more in-depth details on general promotion requirements, refer to the Promotions page. 

Trailing Edge Die-Cut (Ted-C) Letters Template

Template with instructions for Trailing Edge Die-Cut (Ted-C) Letters.
Template must be printed at "actual size".