Announcements
05/20/2026
INFORMATIONAL - Updated 5-20-2026 - 2026 Labeling List and Mail Direction File (MDF) Timeline
Announcements
05/20/2026
DELIVERY - Diplomatic Post Office (DPO) May 20, 2026
Announcements
05/20/2026
INFORMATIONAL - USPS APIs System Release May 21, 2026
Technical Specifications
05/20/2026
Mail.xml Technical Specifications R64.0.0.0
Technical Specifications
05/20/2026
Mail.dat Technical Specifications R64.0.0.0
Release Notes
05/20/2026
July 2026 Release Overview

Note: For the latest technical specifications, please see the July 2026 Price Change Release Notes as they are published. Mail.dat and Mail.XML updates required for this release.