The U.S. Post Office’s CASS system provides certification for mailing addresses. When using certified ZIP+4 addresses and placing the bills in route delivery order, you are essentially doing part of the post office’s job and making their work much easier. By certifying the addresses to which you mail bills, sorting your bills in trays provided by your local post office, and bringing the trays to your post office along with signed forms and payment, you get a discount on postage. For more information about using CASS certification, please call our sales team at (800) 852-5199.

• How much can I save with CASS sorting?
• How do I certify billing addresses?
• How do I sort the bills?
• How do I list any errors in certification?
• How do I check the status of my addresses and certification?