Hello, I wanted to setup a secondary backup server to be able to send outgoing emails.
I have it all up and running, and working. Now I just need to direct our emails to Messagelabs (for spam/AV/reporting). Messagelabs will only accept emails from our external IP address (203.x.x.x)
When I look at the header information of an email, it shows the source ip address as the internal ip address of the exchange server. And Messagelabs returns the email saying that it wont relay emails from this IP address.
I dont know if this is an exchange setting, windows networking setting, or a Cisco router setting.
Is anyone able to tell me how to make our exchange server send emails with its external IP address settings in the email header rather than internal ones.
The server is sitting in the DMZ of our network with one NIC. (192.168.50.x)
Our ISA server routes traffic from the DMZ out to the external network.