http://ribbs.usps.gov/
Effective August 1, 2007, CASS Certified™ software is required to use both the DPV and LACSLink™ products when processing address lists. This new requirement ensures ZIP + 4® codes will be assigned only when the primary number of the address can be validated using the DPV Product, and whether the input address reflects any municipality conversions.
DPV and LACSLink Required on August 1, 2007
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DPV and LACSLink Required on August 1, 2007
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