March 15 2026 Release Notes

INFORMATIONAL - Expansion of Daily USPS API On-Boarding Zoom Support

Merchant Onboarding and Authorization Tech Guide

Merchants need to follow a two-step process to authorize a Label Provider to generate shipping labels on their behalf.

1.   Log in or create a USPS business account on the Customer Onboarding Portal (COP) to get Customer Registration ID (CRID), Mailer ID (MID), and Enterprise Payment Account (EPA). A CRID is a unique identifier for your company. A MID is another identifier which can be part of the barcode on a piece of mail.
2.   Authorize Label Provider in COP. Before the merchant’s account can be used by Label Provider, Label Provider must be authorized. This will also enable Label Provider to generate package labels on behalf of NSA Holders at their NSA rates.
 

USPS Business Portal (COP) Onboarding User Guide

The United States Postal Service (USPS)Business Portal (COP) offers business customers a modern, streamlined way to create and manage a USPS business account set-up and onboard core services.

Business Portal User Account Creation

Instructions for new USPS Business Customers to generate a new account.

MyPFS Portal in MPP Coming Soon - March 2026

Announcement of the release of the MyPFS product addition in My Product Portal. 

INFORMATIONAL - USPS Ship (Package Platform) - INCIDENT 10465287 Data delay, Impacting Multiple Data Feeds

DELIVERY - International Resumption of Mail Service - Effective March 13, 2026

INFORMATIONAL - USPS Ship February Monthly Assessments are Delayed

PTR2 Release Notes_DD_03_10_26

USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

INFORMATIONAL - Commercial Systems Release March 12, 2026

USPS Ship Misshipped Tech Sheet

DELIVERY - DPO Suspensions March 9, 2026

2026 Promotions FAQ

***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

City/State ZIP Code Weekly Compare

3 Digit ZIP/AISU Office List (AISUREPT.TXT)

Cumulative Listing of ZIP Codes Covered by the LACS Database

This document provides a cumulative listing of ZIP Codes covered by the LACS database for LACS^Link®.

AIS Congressional District File (CONG_DIST.TXT)

AIS County Name Table Layout (AISCNTY.TXT)

AMS County Name Table (COUNTY_NAME_TABLE.TXT)

AMS Address Report: AISU Mailing List (ADDRREPT.TXT)

AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)

AISU ZIP Code File (AISUZIPS.TXT)

AISU Contact Information (AISUADDR.TXT)

Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)

Area District Finance File (AREADIST.TXT)

Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)

Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

INFORMATIONAL - Commercial System Releases – March 8, 2026

PTR2 Release Notes_DD_03_07_26

INFORMATIONAL- 2026 National Postal Forum - Workshop Schedule Is Available Online

USPS PTR2 API Known Issues

INFORMATIONAL - End of USPS Web Tools Tracking 3.5.26

Intelligent Mail Matrix Barcode (IMmb) Technical Specifications

Shipping labels on irregularly-shaped packages, softpacks, and polybags can easily become distorted or creased during automated parcel processing making reading the traditional, linear IMpb barcode challenging to scan.  USPS has developed the IMmb to help overcome these challenges and improve package visibility.  IMmb barcodes contain the same data as is in the IMpb barcode; however, they use a more robust, space-efficient robust barcode symbology for encodation.  The smaller barcode footprint allows two IMmb barcodes to be added within unused areas of existing standard shipping labels.  The result is redundancy of the barcode data giving sorters two additional chances to read the barcode. 

The US Postal Service® requires  IMmb barcodes on all package shipping labels.

PTR2 Release Notes_DD_03_03_26

INFORMATIONAL - Delayed Receipt of Data Daylight Savings Time Issue – March 08, 2026

Manifest Mailing System Exception Request Form

Effective April 1, 2026 - The Postal Service is retiring Publication 401 Manifest Mailing System (MMS) used for mail sortation and preparation with hard copy forms and documentation. Affected customers must migrate to Electronic Documentation (eDoc), Full Service, Seamless, and eInduction, for Letters, Cards, and Flats April 1st,, 2026.

Mailers who require a onetime exception to continue using the Manifest Mailing System—due to an inability to meet the deadline to migrate to Full Service, Seamless, or USPS Ship, may do so by submitting their request to their local Manager Business Mail Entry.

INFORMATIONAL - Upcoming Maintenance Change Request - CHG1235463