Release Notes
10/05/2026
Bulk Rates API Release Overview
Announcements
10/05/2026
INFORMATIONAL - Chicago, IL Regional Processing and Distribution Center (RPDC) – Power Restored
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
Data Files
10/05/2026
Informed Visibility Mail Tracking & Reporting Machine Count

List of US Postal Service machines by site, including a description of each machine.

Release Notes
10/04/2026
October 4 2026 - PO! and ProgReg - Release Notes
Announcements
10/02/2026
PROCESSING AND DISTRIBUTION - Chicago, IL Regional (RPDC) - Power Outage
User Guides
10/02/2026
API Access Control Customer Dispute Instructions
Announcements
10/02/2026
INFORMATIONAL - UPDATE: PostalOne! Alert – October 4, 2026
Announcements
10/02/2026
INFORMATIONAL - Commercial System Releases – October 7, 8, and 11, 2026