In my environment 3 separate Exchange 2013 servers in one site, but in different networks:
1. MBOX - Site 1 - network1(172.22.55.x)
2. Internal CAS - Site 1 - network1(172.22.55.x)
3. External CAS - Site 1 - network2(10.10.10.x)
I need send outbound mail trough External CAS, but when I enabled MBOX option "Proxy through client access server" in send connector, all outbound mail flow go trough Internal CAS. How I can change is? How I can change order or cost of CAS servers in outbound flow?