Postal certifications are an absolute necessity if you plan to post bulk mail at discounted rates within specific countries, like the USA, Canada or Australia. Customers like direct marketing agencies or online shops benefit from accurate addresses which culminates in more efficient and timely mail delivery.

Some postal organizations, like the USPS, Canada or Australia Post offer an official certification process for address validation software. AddressDoctor's Software Library has achieved their stringent address data cleansing and validation criteria and received different certifications.