I have struggle for couple weeks to search for answer but most of the sites I have been to were hard to understand the way they mention the IP address and Port #. I decided to build another server for testing configuration. Check out my video Config on the same machine that running SBS Seraver 2011 (Should be work from all Exchange 2003-2012) 1. Spam Firewall Mode with SMTP Proxy Enable. SMTP Server Disable 2. Spam Firewall Mode with SMTP Proxy & SMTP Server Enable I also add the Port 5272 to monitor Xeams Admin Console from outside in the second video You can search video on youtube (Xeams Spam Firewall on the same machine with Exchange Server or Xeams Spam Firewall With Both SMTP Enable) Hope this would help everyone still try to figure out. The software has been working perfect with default configuration. Thank you very much