Outdated information has been removed from the guide, which can be found on PostalPro™.

ACS was designed to reduce the manual address correction notices given to mailers by replacing them with electronic notices. The USPS® strives to deliver the ACS data in the manner described in the guide. For additional information or assistance, you can reach the ACS Support department at 877-640-0724 (Option 1) or via email at

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