Some domains do not accept email from my exchange server, so I created a second smtp connector for these domains to forward through my ISP - smarthost.
Right now I have two SMTP routing group connectors. EX. SMTP1 uses DNS to route, with address space of * cost1. SMTP2 uses smarthost (my isp) to forward mail, address space is email domains that will not go through SMTP1.
Would it work if I kept SMTP1 connector as is and setup SMTP2 with address space of * and cost of 2? So that what ever email will not go through SMTP1 will automatically go through SMTP2 ?