CASS™ is a certification system from the United States Postal Service (USPS) for address validation. A CASS-certified address validation service will standardize your mailing list, update outdated addresses, and verify that addresses are valid and complete.
LiveAddress does the following:
With LiveAddress, the addresses in your list are modified so that they meet the format the USPS expects. For example, 'Avenue' will be abbreviated to 'AVE' and '#' may be replaced by 'STE' or 'APT'.
If an address is misspelled or missing address information, it cannot be approved for a mailing discount. CASS-Certified address validation will attempt to correct misspellings in your address list and add required information, such as the ZIP Code, +4 code, carrier route, or delivery point, that may be missing.
Every now and then, an address will change. LiveAddress will compare the standardized addresses in your list with a list of addresses that have changed. For example, many rural route addresses have been updated to standard city-street style addresses. These addresses will be updated by CASS™ software using LACSLink® (Locatable Address Conversion System).
After the addresses have been standardized, corrected, and updated, they are compared with a list of addresses that the USPS considers valid and complete. This verification ensures that your letter or parcel can be delivered with the information you've provided. Delivery Point Validation (DPV) will also indicate whether or not the address is missing secondary information such as apartment or suite number. CASS™ processing does not validate the person or business that is at the address, but it does validate whether mail can be delivered to an address.