<P> Postal address verification (also known as address standardization, address validation, address verification and CASS certification) is the process used to check the validity and deliverability of a physical mailing address . According to the United States Postal Service, an address is valid (or mailable) if it is CASS - certified, meaning that it exists within the comprehensive list of mailable addresses in their Address Management System . This is different from the credit card Address Verification System (AVS), which is the method used by credit card processors to authenticate ownership of a credit card by verifying that the account on the credit card matches the billing address on file . Credit card AVS does not determine deliverability of an address . </P> <P> Before an address can be certified as deliverable (CASS - certified), it must first be standardized . Standardization converts an address into a standard format by correcting the address, if possible, and adding missing information, such as a ZIP code, to produce a complete address containing a street address, city, state, and ZIP code . </P> <P> If you live at a valid street address and find that it doesn't validate properly, you must contact your local United States Post Office and have the address validated and added to their system . </P> <P> The following methods are used to achieve the most accurate address possible: </P>

How do i get the post office to recognize my address
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