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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

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

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

Announcements
10/21/2026

INFORMATIONAL - European Union Requirements for Product Identifiers Effective November 1, 2026

Technical Specifications
10/21/2026

Mail.xml Technical Specifications for FAST 16.0

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DELIVERY - International Resumption of Mail Service Argentina - Effective October 30, 2026

USPS Ship Disputes and Refunds: Joint Review

USPS Ship Frequently Asked Questions

INFORMATIONAL: USPS APIs System Release Notification - Ship 30.0.1.0 Release

INFORMATIONAL - November 9-13 Recommendations for Live Animal Shipping

INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11152094

PTR1 Maintenance Notes_DD_10_31_26

Labeling List Changes Effective December 1, 2026

Delivery - Hughesville Post Office (20637) - Resumes Operations

INFORMATIONAL - Scheduled Maintenance for November 14, 2026 – Possible Disruption with USPS Payments API

Informed Delivery API Release Notes V1.0.3

Informed Delivery API Technical Specifications V1.0_5.1

INFORMATIONAL - USPS APIs System Release Notification - REVISED

INFORMATIONAL - Oracle PSU Patching - PPI, PASS, MANIF, GEO, and ADP

INFORMATIONAL - Commercial System Releases – October 28, 2026 and November 1, 2026

INFORMATIONAL - PostalOne! Alert – October 25, 2026

INFORMATIONAL - Informed Delivery Mailer Campaign Portal (MCP) Scheduled Outage on October 24

INFORMATIONAL - Postal One System Promotions Not Applied to Postal Wizard Statements

November 1 2026 Program Registration 31.4.0.0 Pre-Release Notes

Mailers Technical Advisory Committee (MTAC) Membership Roster and Vacancies

Plus One Product Requirements (Technical) (Updated 10/23/26)

Intelligent Mail® for Small Business (IMsb) Fact Sheet

DELIVERY - UPDATE - Akron Post Office (35441) Suspended Temporarily

INFORMATIONAL - European Union Requirements for Product Identifiers Effective November 1, 2026

Mail.xml Technical Specifications for FAST 16.0

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