Technical Specifications
10/05/2026
Mail.xml Technical Specifications R65.0.0.0
Technical Specifications
10/05/2026
Mail.dat Technical Specifications R65.0.0.0
Technical Specifications
09/03/2026
National Change of Address - API
Technical Specifications
07/24/2026
Mail.xml Technical Specifications R64.0.0.0
Technical Specifications
07/24/2026
Mail.dat Technical Specifications R64.0.0.0
Technical Specifications
07/13/2026
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.

 

Technical Specifications
05/28/2026
Population Mobility Trends Technical Guide
Technical Specifications
05/21/2026
PTR Tracking API Specifications and Integration
Technical Specifications
04/27/2026
Labeling List Changes Effective June 1, 2026

Effective June 1, 2026, the Postal Service™ will revise Labeling List(s) L007, L012, L014, L015, L016, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the June 1, 2026, effective date through July 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22702.

Technical Specifications
03/18/2026
USPS MCAT - TechSheet

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