CASS™ (Coding Accuracy Support System) is a certification program by the USPS designed to improve the accuracy of address matching and standardization software. Address Verification API leverages CASS™ to ensure that addresses are properly formatted, validated, and corrected according to USPS guidelines. This enhances the efficiency of mail delivery, reduces undeliverable mail, and helps businesses save on postage costs by ensuring that their mail reaches the correct destinations.
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