| | What Is CASS Certification And How It Helps Us Generally speaking, CASS or Coding Accuracy Support System is a software which helps the Postal Services to measure the efficacy of the software which maintains the hygiene of addresses. All vendors and mailers who would like to be enabled to have the USPS evaluate the efficiency of their software which matches addresses, can be offered CASS Certification. CASS software also helps promote and improve the accuracy of the mailers' Zip+4 carrier route along with the 5-digit coding |