Tech Guides
11/26/2025
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

Presentations
11/25/2025
Presentations
11/25/2025
User Guides
11/25/2025
Quick Reference Guide: Bundle Preparation and Handling Recommendations

A guide to ensuring your bundles stay secure during transit.

Announcements
11/21/2025
Presentations
11/18/2025
Release Notes
11/16/2025
Presentations
11/12/2025
Fact Sheets
11/12/2025
USPS Ship Package Data Feeds

This document outlines the steps for shippers to access package data feeds through the USPS Informed Visibility Mail Tracking & Reporting (IV-MTR) application.

Technical Specifications
11/12/2025
Technical Specifications
11/12/2025
Technical Specifications
11/12/2025