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
Technical Specifications
11/10/2025
NCOA API Specifications
Technical Specifications
11/10/2025
National Change of Address - API
Technical Specifications
10/31/2025
Mail.xml Technical Specifications R63.0.0.0
Technical Specifications
10/31/2025
Mail.dat Technical Specifications R63.0.0.0
Technical Specifications
10/06/2025
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.

Technical Specifications
06/27/2025
Enterprise Payment System IV-MTR Data Elements
Technical Specifications
06/13/2025
Informed Delivery Mail.XML Mailer Guide

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