I've got a working TMG2010 setup with a single ISP that hosts our SMTP and all of our Browsing. I've added a 2nd ISP using ISP Redundancy and browsing works just fine. My problem is that I must route my OUTBOUND SMTP traffic only through ISP1. How can I successfully accomplish that?
1) No FPE (and my spam work is done on Exch Edge in DMZ) so I can't use e-mail policy.
2) Can I do it with a firewall rule? or a network route? Please explain how..
Thanks for any help.