I have an SBS 2011 server running Exchange 2010 that utilizes an SMTP smart host that receives all inbound email which then forwards to the Exchange server. What I have noticed is that none of the content filtering I have enabled on the Exchange server is working and applying SCL ratings because the smart host is internal and on the same domain. After researching this scenario it seems that Exchange by default will not filter any internal email. I would like to change this and allow Exchange to apply an SCL rating on inbound mail that it receives from the smart host. What would be the proper configuration to achieve this and force Exchange to apply the SCL content filtering?
Any information is appreciated.