Utility Star has incorporated a module that arranges for integration to CASS systems which provides mailing address verification, sorting, and CASS certification forms.  This module is designed to work with Satori Software’s Mailroom Toolkit by means of a seamless API and with Pitney Bowes by means of a file import/export utility. Utility Star can be configured to integrate with other CASS vendors. Click on the following link for more information about CASS software and how it is works:
http://www.usps.com/ncsc/addressservices/certprograms/cass.htm