Data Files
12/01/2025
Pending Route Adjustment File

This Excel sheet details route adjustments for November 2025 thru January 2026.

Technical Specifications
11/28/2025
NCOA API Specifications
FAQs
11/28/2025
Modernization of Address & NCOA Processing with APIs - Q & A
Release Notes
11/26/2025
January 4 2026 Release Notes
Program Requirements
11/26/2025
INFORMATIONAL - International Suspension of Mail Service - Effective November 28, 2025
Tech Guides
11/26/2025
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

Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML PrePROD WSDLs
Tech Guides
11/26/2025
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

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