Depending on what business logic you’d like to take based on your verification result, you can toggle your US Address Strictness Settings in your Dashboard. There are 3 possible Strictness Levels:
- Strict: Only US addresses that Lob and the USPS deem deliverable can be successfully used as the to address for postcard, letter, folded self-mailer or check resources. Postcard, letter, folded self-mailer and check requests sent with non-deliverable addresses will return a 422 (Unprocessable Entity) error. This maps to a deliverability value of deliverable (see documentation). If addresses have never been run through verification (i.e. were created in the past), they will also err when used as the to address.
- Normal: Postcards, letters, folded self-mailers, and checks will be created for addresses that Lob and the USPS deem deliverable, as well as addresses for which secondary information is extraneous or missing. Otherwise, you will receive a 422 (Unprocessable Entity) error. This maps to the deliverability values of deliverable, deliverable_unnecessary_unit , deliverable_incorrect_unit and deliverable_missing_unit (see documentation). If addresses have never been run through verification (i.e. were created in the past), they will also err when used as the to address.
- Relaxed: All postcard, letter, folded self-mailer and check resources will be successfully created and mail delivery will be attempted, regardless of address validity. You will not receive a 422 (Unprocessable Entity) for Address Strictness reasons.