How Often Does My List need a CASS Certification?

At Action Mail we recommend CASS certification of your list before every mailing. Coding Accuracy Support System (CASS) improves the accuracy of delivery point codes so updating it before every mailing makes it more likely that mail will be delivered correctly.

To receive bulk mail USPS rates the USPS requires that lists have CASS certification 180 days prior to the mail date for non-carrier route mailings and 90 days prior to the mail date for carrier route mailings. If CASS certification is done before these dates the mailing should not qualify for USPS bulk mail automation postage rates.

At Action Mail we CASS certify and run our lists through NCOA (National Change of Address) to ensure high delivery rates and the lowest postage rates. We are also happy to CASS certify lists periodically to provide opportunities to clean and update lists.

We recommend CASS certifying lists prior to every mailing but technically they only need to be CASS certified 90 or 180 days prior to the mailing depending if it is a carrier route list.