CASS certification is required by the US post office to obtain bulk rates and is based on the content of your data. There is a web page at USPS that explains this.
Theatre Manager provides the tools to help your database become CASS certified
CASS certification is not actually for the software, it is for CONTENTS OF THE DATA in a database.
It means that each database of addresses needs to be CASS certified and verified annually. When that is done, you get a certificate about YOUR DATA that allows your venue to have the bulk rate for subsequent mailings. This means you can do it once a year.
The process is generally to:
and that will CASS certify your venue's data for the year (because your data was through the process)