I've just setup a HA pair of VLM-1000 servers and configured a VIP for load balancing SMTP traffic for application servers and scanners (scan2mail). I have 2 Exchange 2010 servers in Multi-role setup (CAS-HUB-MBX). The application servers, the Exchange servers and VLM servers are all on the same subnet.
I would like the VIP to support L7 Transparency so I can direct the server to a specific Receive Connector based on the Client IP. I've selected Real Servers are Local and L7 Transparency options as well as unchecking the Enable Non-Local Real Servers and unchecking Server NAT option.
How can I get the application servers to connect through the VLM to the Exchange server with their own client IP while not moving any servers to another subnet?
I've read something about an additional L7 Header as X-Forwarded-For. Will this work for SMTP traffic as well?