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How does the USPS know that a mailer is giving them a “good” address?

April 26, 2017address giving mailer USPS

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How does the USPS know that a mailer is giving them a “good” address?

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if the address was supplied by a bulk mailer who uses a CASS Certified engine. To get CASS Certified, the USPS sends you a large list of addresses to validate. If your address validation engine is at least a certain percentage correct, it will be certified.