I have an Windows 2003 64 bit server running Exchange 2007. We recently changed the IP address from a 192.168.1.xx to 192.168.10.xx network.
Now users can send email, but they cannot receive anything.
When I try and telnet to the server on port 25 I get the message "421 4.3.2 Service not available, closing transmision channel"
I am at a loss, what should I check?
I know the previous company has fooled with bindings, and the customer is down!
If you have any firewall or antispam agent in between than need to change the natting of the ip address and specify the new ip address given to the server.