Intelligent Mail Matrix Barcode (IMmb) FAQ Page

The IMmb is a two-dimensional, GS1 DataMatrix barcode used for routing and tracking of packages within the USPS processing network.  Presently the IMmb is used in combination with the Intelligent Mail Package Barcode (IMpb) to improve processing efficiency. 

PTR Domestic Scan Events and Descriptions

USPS Ship Frequently Asked Questions

USPS Ship Frequently Asked Questions

Newspaper Mail Preparation & Entry

Guidance for Newspaper Publishers 

Periodicals: Customer Service Issues

Guidance for Resolving Periodicals Delivery Issues

2025 Promotions FAQs

Periodicals Account Maintenance - Frequently Asked Questions (FAQ)

2025 Integrated Technology Enrollment Guide

First-Class Mail and Marketing Mail Growth Incentives FAQs

On September 27, 2023, the Postal Regulatory Commission (PRC) approved the Postal Service request to make Mail Classification Schedule (MCS) changes to establish two distinct Mail growth incentives — a First Class Mail Growth Incentive and a Marketing Mail Growth Incentive. The incentives will run concurrently from Jan. 1, 2024 through Dec. 31, 2024. The following are some frequently asked questions and answers on these incentives.

USPS Nonprofit Authorizations - Frequently Asked Questions

Provides answers to questions for customers applying for a USPS Nonprofit Authorization.