What Is CASS Certification?

CASS (Coding Accuracy Support System) certification is the United States Postal Service's address certification program. To send bulk mail, your addresses must be certified using CASS approved software every six months and address bar codes must appear on your mailing pieces. Sending bulk mail in this way results in significant discounts. Success Tracking is setup to take full advantage of CASS certification. To learn how to certify your addresses, see CASS Certifying Addresses in this section.