Delivery Point Validation (DPV) is the USPS system of ensuring that the delivery point identified by an address can receive mail. The USPS address reference data contains DPV data.

The USPS adds false addresses to the DPV reference data to detect mailers who attempt to generate mailing lists from the reference data. The USPS encrypts its reference data. If an address record set contains a false positive address, the mailer has used decryption software to read the reference data and create a mailing list.