INFORMATIONAL - Updated PostalOne! System (PO!) – Delivery Sort Container Discount not applied

USPS APIs Access Control Data Dictionary

Detailed information on the USPS APIs data elements available through the Informed Visibility Mail Tracking & Reporting (IV-MTR) application for API Access Control.

INFORMATIONAL - PostalOne! System (PO!) – Delivery Sort Container Discount not applied

Marriage Mail Incentive Fact Sheet

Marriage Mail is a form of direct mail in which marketing service companies combine or “marry” advertisements (e.g., coupons or sales notices) from multiple companies into one mail piece to reduce the cost of the mailing for individual advertisers. The Marriage Mail Incentive is a discounted (incentive) price offered on Saturation (including EDDM-Commercial) and High Density Plus Marketing Mail letters and flats which meet certain requirements including weight and advertiser content. It has been developed in response to market needs and will benefit the mailing industry, small businesses, consumers and the USPS. As of July 12, 2026, the Incentive price will be a 20% discount on qualifying pieces.

***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

99% Mailer Move Update Process Order Form

This form is required to be completed for the 99% accurate certification testing process.

USPS Ship Data Dictionary

Detailed information on the USPS Ship (Formerly Package Platform) data elements available through the Informed Visibility Mail Tracking & Reporting (IV-MTR) application. Please note that items in bold text were updated or added recently.

City/State ZIP Code Weekly Compare

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

3 Digit ZIP/AISU Office List (AISUREPT.TXT)