I have a live network which is running a 2k3 and 2k7 exchange with external internet access. I am wanting to demote and uninstall 2k3 exchange. So i have created a test environement which is exact replica to the real one including ip address. With the exception of the external ip address which has change. how can i send an email to my test environment from external with the mx record still pointing to my live system. I have telnet to port 25 on my test setup but i need final verification that the changes i have done have worked. Can anyone suggest anything.
Many thanks in advanced