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
2026 Mailing Promotions Webinar Slides
Presentations
11/25/2025
2026 Mailing Promotions Webinar
User Guides
11/25/2025
Quick Reference Guide: Bundle Preparation and Handling Recommendations

A guide to ensuring your bundles stay secure during transit.

Announcements
11/24/2025
DELIVERY: Central Area - Illinois 1 - Wilmette Post Office (60091) - Suspended
Announcements
11/24/2025
DELIVERY: Atlantic Area - Pennsylvania 1 District - Amity Post Office (15311) - Office Temporarily Suspended
Announcements
11/21/2025
PCC Voice Challenge - ThankfulforPCC
Data Files
11/21/2025
PTR Domestic Scan Events and Descriptions
Announcements
11/20/2025
INFORMATIONAL - Thanksgiving Holiday 2025 Shipping Recommendations for Lives Animals
Announcements
11/20/2025
INFORMATIONAL - Commercial System Releases – November 20, 2025
Announcements
11/19/2025
DELIVERY - Southern Area – South Carolina District Sunset Post Office (29685) – Closed Indefinitely
Presentations
11/18/2025
Addressing and NCOALink Modernization
Release Notes
11/16/2025
November 16 2025 Release Notes
Announcements
11/14/2025
INFORMATIONAL - Web Tools Migration Webinar
Announcements
11/14/2025
INFORMATIONAL - Scheduled Commercial Systems Activities November 15, 2025
Announcements
11/14/2025
INFORMATIONAL - January 2026 Competitive Price Change
Announcements
11/14/2025
DELIVERY - WestPac -CO-WY District Poncha Springs (81242) - Closed
Announcements
11/14/2025
INFORMATIONAL - Peak Season Network Update Webinars - Follow Up
Announcements
11/13/2025
INFORMATIONAL - January Price Change 2026 - Commercial System Releases January 4, 2026
Announcements
11/13/2025
INFORMATIONAL - Important Update: Periodicals Mailing Privileges Application Process
Presentations
11/12/2025
Addressing Modernization - API
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
Addressing API Specifications
Technical Specifications
11/12/2025
Addressing API - Vendors
Technical Specifications
11/12/2025
Addressing API - End Users - Tech Sheet