Details about CASS Certification, CASS Report, Obtaining USPS CASS certification for applications, and Modifying the CASS 3553 report template
CASS certification overview
The USPS® Coding Accuracy Support System (CASS™) is a service offered to mailers, service bureaus, and software vendors that improves the accuracy of delivery point codes, ZIP+4 Codes, 5-digit ZIP Codes, and carrier route information on mail. CASS provides a common platform to measure the quality of address matching software and useful diagnostics to correct software problems.
To receive greater discounts on bulk mail postage, you can process your address list with USPS-certified address standardization software; referred to as CASS certification. To qualify for the CASS certification™ discount, you must generate a CASS report with the standardization software during processing and submit the completed form with the mailing.