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For software vendors and service bureaus, CASS Certification must be renewed annually with the USPS to meet current CASS Certification cycle requirements.
CASS Certified products are listed in USPS literature and on its web site. CASS software will correct and standardize addresses. It will also add missing address information, such as [[ZIP Code|ZIP Codes]], cities, and states, to ensure the address is complete. Starting with 2007 Cycle L, CASS software will also perform [[Delivery Point Validation]] to verify whether or not an address is a deliverable address and access the USPS [[Locatable Address Conversion System]] to update addresses that have been renamed or renumbered. Cycle L also requires that the address be confirmed with the [[Delivery Point Validation]] before adding a +4 Code to the ZIP Code.
A correct address in turn saves the Postal Service time, money and man-power by reducing the volume of 1) non-deliverable mail; 2) unsorted mail; 3) mail that is deliverable, but requires extra effort to determine the proper ___location to deliver it to.<ref>{{cite web | url = http://ribbs.usps.gov/files/CASS/CASS%5FCYCLE%5FL/CASS_CERT_REQ_MAILERS_GUIDE.PDF | title = CASS Certification Requirements, A Mailer's Guide | publisher = United States Postal Service | accessdate = 2007-07-27 | date = 2007-06-26 }}</ref>. Mailers who use CASS software may be able to qualify for discounted postage rates from the USPS.
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