The first step to reducing postage cost is to make sure the address records of your mailing list are within the standards set by the U.S. Postal Service. KD Mailing & Fulfillment uses CASS (Coding Accuracy Support System) certified software approved by the USPS. We repair recognizable addresses that are incorrect, and standardize them to meet the USPS specifications. Then we append proper ZIP +4 and carrier route codes, and all other required USPS endorsements. Finally, we presort your list — arranging all of the addresses in a sequence that meets USPS regulations. And we produce the documentation and custom address labels needed to obtain your postal discounts and ensure deliverability.