Clean Mailing Lists

The definition of a great mailing list, is a mailing list that is as accurate, up-to-date and as clean as possible. So, we make it our top priority to clean and update our mailing lists as frequently as possible. Since we perform regular list updates, we can ensure that you receive only the very best data that’s available.

In turn, you’ll see less returned mail, get a higher return on your investment and be a happy LeadsPlease mailing list customer!

Above and beyond the data quality processes applied by our data partners, we also perform rigorous data quality tests and scrub our lists through multiple USPS approved software, to ensure that you receive top-quality mailing lists.

On a monthly basis we take a random selection of the data provided by our data partners and apply thorough independent USPS tests to ensure that the data is as accurate and uptodate as possible.

Clean Mailing Lists should pass the following USPS tests :


The USPS National Change of Address (NCOA) file is a databank of more than 120 million permanent address changes, updated weekly and covering a rolling 36-month period of reported move information. NCOA identifies movers at the individual, family and business level. We scrub each list database against the NCOA file on a weekly/monthly basis to assure that we maintain the most current address on each consumer/business record.


Coding Accuracy Support System (CASS) is the USPS approved software that we use to evaluate the accuracy of addresses, and to correct incomplete/incorrect street addresses. If an address is missing address information, such as ZIP codes, cities, and states, CASS software will ensure that the address is corrected and complete. Starting with 2007 Cycle L, CASS software will also perform


Delivery Point Verification (DPV) is used to verify whether or not an address is a deliverable address; if an address is not deemed deliverable, we will update addresses that have been renamed or renumbered or discard incomplete/undeliverable addresses.

Can we help you?

Call us on 866 306 8674

for free expert assistance.