Intelligent Mail® Package Barcode (IMpb) ACS™

IMpb ACS allows parcel mailers who print the Intelligent Mail package barcode to receive an electronic address correction using that barcode.

Who is IMpb ACS for?




IMpb ACS allows parcel mailers who print the Intelligent Mail package barcode to receive an electronic address correction using that barcode. When a parcel shipper registers the Mailer ID for IMpb ACS, certain printed ancillary service endorsements will trigger the creation of an electronic ACS notice. IMpb ACS allows the parcel shipper to either vary their ancillary service and parcel disposition, or specify when only a specific ancillary service and disposition is desired.

The Electronic Address Correction Fee is charged on your monthly ACS invoice for each ACS COA or Nixie notice provided. Please refer to the DMM Notice 123 Domestic Other Service, Address Correction Service for all related fees at:

The ACS billing cycle is from the 25th of the month to the 24th of the next month. New ACS customers are setup with the improved monthly ACS billing or customers can select a SingleSource ACS account and are invoiced through Addressing and Geospatial Technology (AGT) Accounting Services. Invoices are posted to your EPF account within 6 days following the end of the ACS billing cycle, unless otherwise notified. Information regarding file formats, AGT Billing, and invoice files can be found in the ACS File Format Technical Guide.



Featured Resources

Tech Guides
Intelligent Mail® Package Barcode (IMpb) ACS™ Technical Guide

Technical guide for users of Intelligent Mail® Package Barcode (IMpb) Address Change Services (ACS). Includes a solution overview, features, participation requirements, and service endorsement options.

Related Products

Traditional ACS™

Traditional ACS is one of the four ways to participate in ACS, where mailers receive notifications of undeliverable mail (UAA) and change-of-address (COA) electronically. The Intelligent Mail® barcode is not required to receive Traditional ACS.

OneCode ACS®

OneCode ACS allows customers mailing First-Class Mail®, Standard Mail®, and Periodical flats or letters to receive electronic or automated address corrections using the Intelligent Mail® barcode.

Intelligent Mail® Package Barcode (IMpb)

The Intelligent Mail Package Barcode (IMpb) provides the best commercial prices with the largest discount available, piece-level tracking information at no additional charge for most products, and access to new products, services, and enhanced features. The addition of two (2) supplemental IMmb’s to the existing IMpb on a USPS shipping label results in enhanced package visibility with less mail rework.

Shipper Paid Services

Shipper Paid Services is an ACS fulfillment option that allows parcel mailers to receive an electronic address correction and pay forwarding or return postage via their ACS account rather than charging the customer.