It makes sense that USPS considers it a bug to freely give away the data that it sells: https://postalpro.usps.com/mailing-and-shipping-services/NCOALink https:

It makes sense that USPS considers it a bug to freely give away the data that it sells: https://postalpro.usps.com/mailing-and-shipping-services/NCOALink https://postalpro.usps.com/mailing-and-shipping-services/NCO...