Postalocity uses a reputable, third-party address verification vendor that updates its database directly from the USPS every two weeks. Each time you click “Start Processing”, Postalocity connects with this service and compares your addresses with the database. It checks for proper formatting, address changes, misspellings, and missing information. If your mailing has less than 100 recipients, processing will not check for change-of-address, but it will generate a properly formatted address know as a “CASS Certified” address. If you send over 100 mail pieces then you will receive a National Change of Address (NCOA) list via email as long as you have a PAF signed. You can choose not to update addresses in your mailing, but we do recommend downloading the list of address updates for your records.