The Coding Accuracy Support System (CASS) is a procedure developed by the United States Postal Service to ensure the accuracy and standardization of delivery address data.  It contains strict guidelines for checking the spelling of streets and cities, correcting zip codes, filling in missing information, correcting errant data, and assigning additional postal information such as carrier route codes, delivery point barcodes, counties and more.  Top-quality software provided by Firstlogic, Inc. (formerly known as Postalsoft) is utilized to achieve these results.

Customer data is CASS-certified at the earliest stage of handling to help provide for smooth processing in any other data manipulation and definitely to assist in efficient mailstream delivery.