Announcements
10/28/2026
INFORMATIONAL - USPS APIs System Release Notification November 5
Announcements
10/28/2026
INFORMATIONAL -Informed Visibility USPS Ship Subscription Delays During Daylight Savings Time
Announcements
10/28/2026
DELIVERY - International Resumption of Mail Service Argentina - Effective October 30, 2026
Presentations
10/28/2026
USPS Ship Disputes and Refunds: Joint Review
FAQs
10/28/2026
USPS Ship Frequently Asked Questions

USPS Ship Frequently Asked Questions

Announcements
10/27/2026
INFORMATIONAL: USPS APIs System Release Notification - Ship 30.0.1.0 Release
Announcements
10/27/2026
INFORMATIONAL - November 9-13 Recommendations for Live Animal Shipping
Announcements
10/27/2026
INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11152094
Release Notes
10/27/2026
PTR1 Maintenance Notes_DD_10_31_26
Data Files
10/27/2026
Labeling List Changes Effective December 1, 2026

Effective December 1, 2026, the Postal Service™ will revise Labeling List(s) L001, L004, L009, L010, L012, L015, L016, L201, L602, L605, 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 December 1, 2026, effective date through January 31, 2027, expiration date. The changes will be published in the Postal Bulletin, Issue #22715.
 

Announcements
10/26/2026
Delivery - Hughesville Post Office (20637) - Resumes Operations
Announcements
10/26/2026
INFORMATIONAL - Scheduled Maintenance for November 14, 2026 – Possible Disruption with USPS Payments API
Release Notes
10/24/2026
Informed Delivery API Release Notes V1.0.3
Technical Specifications
10/24/2026
Informed Delivery API Technical Specifications V1.0_5.1
Announcements
10/23/2026
INFORMATIONAL - USPS APIs System Release Notification - REVISED
Announcements
10/23/2026
INFORMATIONAL - Oracle PSU Patching - PPI, PASS, MANIF, GEO, and ADP
Announcements
10/23/2026
INFORMATIONAL - Commercial System Releases – October 28, 2026 and November 1, 2026
Announcements
10/23/2026
INFORMATIONAL - PostalOne! Alert – October 25, 2026
Announcements
10/23/2026
INFORMATIONAL - Informed Delivery Mailer Campaign Portal (MCP) Scheduled Outage on October 24
Announcements
10/23/2026
INFORMATIONAL - Postal One System Promotions Not Applied to Postal Wizard Statements
Release Notes
10/23/2026
November 1 2026 Program Registration 31.4.0.0 Pre-Release Notes
Contact Lists
10/23/2026
Mailers Technical Advisory Committee (MTAC) Membership Roster and Vacancies
Program Requirements
10/23/2026
Plus One Product Requirements (Technical) (Updated 10/23/26)

Plus One Updated 10/23/26

Fact Sheets
10/22/2026
Intelligent Mail® for Small Business (IMsb) Fact Sheet

This fact sheet contains an overview of the IMsb Tool, its benefits, and how it works.

Announcements
10/21/2026
DELIVERY - UPDATE - Akron Post Office (35441) Suspended Temporarily