CASS (Coding Accuracy Support System) certification is a service which helps ensure your list is accurate.  When a list is processed for bulk mail rates part of the procedure is to CASS (Coding Accuracy Support System) certify the list. 

This is a service the Action Mail provides to measure the quality of your address database and to compare it to what the USPS has as valid address. If a record comes back as non-cassed ,  this means it did not match up with what any address that the USPS has registered.  There could be a number of reasons that it did not CASS, some as simple as a misspelled street name or an incorrect suite number.  During the CASS certification process our software will also automatically correct some addresses to match exactly what the USPS has on file.  We will also add the Zip +4 to help ensure timely and accurate delivery.

When each list is processed Action Mail will send a list of Non-Cass records, or records that did not match with the addresses the USPS has registered as deliverable addresses.  What we suggest you do is take a look at the non-cassed records and try make as many corrections as you can.  This can be a tedious task of looking up old records, correcting misspellings, contacting people to get the correct addresses or doing internet research, but if you can maintain accurate databases this will ensure that your mail gets sent to the correct addresses.  If you send to the non-cassed records then there is a good chance they won’t be delivered and it will result in money wasted on postage and printing.

Typically we recommend correcting or removing the non-cassed records, especially if they are sent standard mail.