Announcements
04/14/2026
INFORMATIONAL -PostalOne! System - INCIDENT 10567141 Error with Mail Entry Additional Postage Assessment Report
Announcements
04/14/2026
INFORMATIONAL - National Postal Forum 2026 Keynote Speaker – Jeremy Gutsche
Tech Guides
04/14/2026
USPS Ship Monthly Averages Tech Sheet
Announcements
04/13/2026
INFORMATIONAL - USPS Enhanced Addresses API – Coming July 2026
Announcements
04/13/2026
INFORMATIONAL - Informed Delivery Campaign Reporting Update April 2026
Applications/ Forms
04/13/2026
Addressing API License Agreement
Announcements
04/13/2026
INFORMATIONAL - 2026 National Postal Forum Leadership Insight Sessions
Announcements
04/13/2026
INFORMATIONAL - Package Tracking API Provisioning Cancelled
Technical Specifications
04/13/2026
Mail.dat Technical Specifications R64.0.0.0
User Guides
04/13/2026
Provisioning Enterprise Payment (EPS) and USPS Ship (formerly Package Platform (PPC)) Data through Informed Visibility® (IV®)

This guide provides instructions for receiving Enterprise Payment System (EPS) and USPS Ship (formerly Package Platform Concept (PPC)) data through the IV Mail Tracking & Reporting (IV-MTR) application. Instructions include how to get access, create and manage a data feed, manage the address book, and manage data delegation.

Data Files
04/13/2026
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 LACSLink®.

Release Notes
04/12/2026
April 12 2026 Time Limited Price Change (TLPC) 2026 Release Notes
Announcements
04/10/2026
INFORMATIONAL - July 2026 Market Dominant Price Change Filing Webinar - Friday, April 17, 2026
Announcements
04/10/2026
DELIVERY - Southern Area - AR-OK District - Wilton Post Office (71865) - Permanently Suspended
Announcements
04/10/2026
INFORMATIONAL - Time Limited Price Change 2026 Commercial System Releases – April 12, 2026
Announcements
04/09/2026
INFORMATIONAL - U.S. Postal Service Recommends New Prices for July
Release Notes
04/09/2026
PTR2 Release Notes_DD_04_07_26
Announcements
04/08/2026
INFORMATIONAL - Parcel Dimension Compliance New Rules
Release Notes
04/08/2026
April 12 2026 Time Limited Price Change (TLPC) 2026 Release Overview
Announcements
04/08/2026
DELIVERY - International Service Resumption to United Arab Emirates - Effective April 10, 2026
Announcements
04/08/2026
INFORMATIONAL - USPS APIs Critical Maintenance April 8, 2026
Announcements
04/07/2026
DELIVERY: MILITARY POST OFFCE (MPO) 09309 - RESUMED MAILING SERVICE
Announcements
04/07/2026
INFORMATIONAL - Package Tracking API Provisioning - Reminder
Fact Sheets
04/07/2026
IMpb/IMmb Electronic File Transmission Requirements
Quick Service Guides
04/07/2026
Enterprise Payment System (EPS) Deposit Instructions

These instructions include general technical information and instructions for sending electronic funds into your EPS account. The information here is designed for trust customers (and debit customers who need to initiate a fund transfer to cover a debit return problem).