Block PO Box Addresses at Checkout for UPS, FedEx & Startrack

Address Validation vs. Address Verification: Address validation checks that an address meets format and business rules: house number present, postal code in the correct format, no PO Box, no blocked characters or restricted postal codes. It does not check whether the address actually exists. Address verification (sometimes called address autocomplete or address lookup) uses external services like USPS, Google, or Loqate to confirm that a street, city, and postal code combination is real and deliverable. Address Ninja performs validation — it enforces your rules at checkout — but it does not perform verification. If you need to confirm that an address exists, you'll need a separate verification or autocomplete service.