I have set up a windows 2008 R2 server to route email from Exchange 2010 using SMTP Server in IIS. I have 3 seperate domains and would like to route each one through a different internal and external IP for (IP Reputation etc), at the minute it is only using the primary IP on the server to route email externally. Is this at all possible using SMTP Server in IIS, or is there any other software available to do this?