Delivery Point Validation™ (DPV®) is the process of verifying that an address is actually deliverable, meaning that mail can be sent to that address.
A delivery point is the end of the road for mail. It is the final destination for letters or packages carried by the US Postal Service. A delivery point can be a mailbox at the curb, a PO box, or a mail slot in a front door.
This is different from a street address because a single street address may still have multiple delivery points, such as individual units in an apartment building. The USPS provides a unique number that represents each delivery point.
To obtain this level of accuracy (and thus qualify for mailing discounts and avoid costly returns), make sure to verify your addresses with LiveAddress.