CASS (USPS^® certification process for ZIP + 4 matching software) is a certification program used by the United States Postal Service^® to ensure the quality of ZIP + 4 coding systems. Processing a mailing list through a CASS Certified™ ZIP + 4 system is required to receive USPS^® presort discounts.

To take advantage of automation discounts, the mailing list must be CASS processed within 180 days of the mail date. Carrier route discounts require the mailing list be CASS processed within 90 days of the mail date, and basic presort discounts require the mailing list be ZIP Code™ verified within one year of the mail date.

ZIP + 4 processing increases the quality of your address data thereby improving the deliverability of your mailing. ZIP + 4 processing will standardize address information and apply current postal codes.

Some addresses will not be + 4 coded because they do not match the ZIP + 4 database; these are potentially problem addresses. Error codes are offered to help you understand what might be missing or incorrect with your addresses that do not + 4 code.

ZIP + 4 coding works in ranges and even though an address + 4 codes, there is no guarantee it is a valid delivery point. To confirm whether or not an address is a valid USPS delivery point, we provide DPV™ as part of our ZIP + 4 processing. DPV also identifies whether or not an address is a commercial mail receiving agency.

Together, ZIP + 4 and DPV will help you eliminate undeliverable mail and reduce mailing costs.

Sample:

Input:	Output:
Mr. and Mrs. Johnson	Mr and Mrs Johnson
123 Apple Boulevard	123 NE Apple Blvd
Anytown, MN 55123	Anytown MN 55123-0012

Turnaround time is 4 hours using A-Qua Web or one business day using the paper form (pdf).

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