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CASS
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An acronym for “Coding Accuracy Support System,” which is a service offered to mailers, service bureaus, and software vendors by the United States Postal Service for improving the accuracy of address matching software. CASS certified software converts an address into the proper format so that it is acceptable by the postal service, ensuring that the piece will qualify for automated mail rates. The software verifies delivery point codes, ZIP+4 Codes, 5-digit ZIP codes, and carrier route codes.
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