If you think a message is a spam but it does go into your mailbox without being filtered by the IronPort Anti-Spam service, you may report the spam to Cisco, the vendor of IronPort. What you need to do is to send the spam as attachment in a new email message to spam@access.ironport.com.

If you are using MS Outlook, we would suggest you to compose a new message and attach the spam in the message (choose Insert -> Item from the menu and select the spam concerned).