The USPS Coding Accuracy Support System (CASS) measures the accuracy of address-matching software. To receive automated processing discounts, you must use software that has been CASS-certified and registered by the vendor with the USPS. The following regulations apply:
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The address-matching software used must have been CASS-certified for the current CASS cycle.
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Coding of each file must be performed at least annually (e.g., the mailing date must be within one year of the coding date).
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The database used during an address-matching run must be "current." A current database is defined by the matrix in DMM 708.
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USPS Form 3553 lists the address-matching software used to process the mailing list. This report must be submitted with each mailing and must represent all address lists used to generate that mailing.
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CODE-1 Plus includes LACSLink, DPV, and SuiteLink processing. For further details regarding the options and requirements for CASS certification, see the USPS-issued document on CASS Cycles on the https://postalpro.usps.com/ website. CODE-1 Plus does not produce a CASS statement if LACSLink, DPV, or SuiteLink processing is turned off.