In Exchange you can route mail through a smart host.  In this case I would have Exchange route mail to Xeams, and then I want Xeams to route mail to Time Warner's open relay(smtp-server.dc.rr.com).  Sometimes spam filters will block email from my server depending on the DHCP address I have at the time.  Forwarding through smtp-server.dc.rr.com prevents this from being an issue.

Hi, I am new to Xeams (installed today), but I have setup exactly what you seem to want through "Xeams - Smart Host".  Go to "Server Administation" then "Manage Smart Host".  All you need is a Hostname/IP address and TCP/IP Port number.