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. 

Technical Specifications
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® recommends incorporating the IMmb on all package shipping labels and it will soon become a requirement for HAZMAT shipments.

First-Class Mail and Marketing Mail Growth Incentives FAQs

On August 11, 2023, the U.S. Postal Service filed notice with the Postal Regulatory Commission (PRC) requesting approval to make certain Mail Classification Schedule (MCS) changes to establish two Mail growth incentives — a First Class Mail Growth Incentive and a Marketing Mail Growth Incentive. If approved, the incentives will run concurrently from Jan. 1, 2024 through Dec. 31, 2024. This document contains some frequently asked questions and answers on these incentives.