IMpb/IMmb Electronic File Transmission Requirements

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).

Informed Delivery® Post-Campaign (IDPC) Data through IV-MTR® Data Dictionary

This document describes the Informed Delivery Post-Campaign (IDPC) data fields available through the IV-MTR application.

INFORMATIONAL - Executive Retirement - Sharon Owens

USPS PTR2 API Known Issues

Automated Zone Indicator (AZI) Table

The AZI table lists each five-digit ZIP Code™ and is an indicator of the type of processing that typically takes place on letter mail destined for each ZIP Code. Each number in the file is a ZIP Code appended with a numeric zone indicator. The five numeric indicators are as follows:

1. Two Pass Zones: Automated two-step sector/segment at mail processing facilities
2. 876 Carrier Route Sort Zones: Automated incoming secondary carrier route sorting at plants
3. Carrier Route Barcode Sorter (CSBCS) Zones: Automated walk sequence sorting on CSBCS machines at delivery units
4. Delivery Barcode Sorter (DBCS) Zones: Automated walk sequence sorting on DBCS machines at plants [i.e., sectional center facilities (SCFs)] or at delivery units
5. Manual/Mechanized Zones: No automated sorting; no tracking code scans should be generated from facilities matched to these ZIP Codes

April 12 2026 Time Limited Price Change (TLPC) 2026 Release Notes

DELIVERY - WestPac Area - ID-MT-OR District - Office Temporarily Closed - North Bend Post Office

INFORMATIONAL - USPS APIs System Deployment April 18, 2026

INFORMATIONAL - USPS APIs System Deployment April 12, 2026

PTR2 Release Notes_DD_04_02_26

PTR2 Release Notes_DD_04_04_26

Known Issues List 4.3.2026

USPS APIs Release Notes

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

DELIVERY - Southern Area - Texas 3 District - Los Jardines Post Office (78237) - Temporarily Suspended

INFORMATIONAL -Upcoming USPS.com Maintenance CANCELLED

DELIVERY Resumption of Mail Service to Lebanon- Effective April 3, 2026

PCC Events (April 2026)

Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q2 FY26)

ACS Nixie stats by industry for FY26 Q2.

Destination Entry Service Standard Directory

Combined Service Standard Directory-PRI

Supplemental Service Standard Directory-PRI

Supplemental Service Standard Directory-PKG

Supplemental Service Standard Directory-PFC

Supplemental Service Standard Directory-PER

Supplemental Service Standard Directory-MKT

Supplemental Service Standard Directory-GAL

Supplemental Service Standard Directory-GAH

Supplemental Service Standard Directory-FCM

Combined Service Standard Directory-GAL

Combined Service Standard Directory-PKG

Combined Service Standard Directory-PFC

Combined Service Standard Directory-PER

Combined Service Standard Directory-MKT

Combined Service Standard Directory-GAH

Combined Service Standard Directory-FCM

3D Base Service Standard Directory

Publication 199: Intelligent Mail Package Barcode (IMpb) Implementation Guide for Confirmation Services and Electronic Payment Systems

INFORMATIONAL - USPS Modernization Through Package Equipment Upgrades in April 2026

INFORMATIONAL - Atlantic Area AIM Meeting June 2, 2026