Hopefully someone can assist.
I have recently set up a new Exchange Server within my network. I am able to send out email from the server quite fine.
I have not amended any of my MX records as yet to point to my static IP address from my ISP. All I am trying to do at the moment is telnet via port 25 to my box (to test connectivity prior to changing the MX records).
At first I thought it was issues with my Netcomm modem, not having the port forward set up correctly. After much playing around I installed PFPortChecker from PortForward.com, shut down the exchange services and tested on the server whether the port forward works. PFPortChecker came back and said everything is fine and the port is open.
I can telnet to port 25 using the internal IP address, and the Exchange SMTP component seems to work fine, however when telneting on the external ip address from the ISP it does connect.
I have contacted the ISP, and they also confirm that from their side port 25 is open, but they also cannot connect.
My external static is 220.127.116.11
I am pretty new to 2007 so I could be missing something fairly easy. Firewall has been turned off on the Server, as well as the client machines that I am using to perform tests.
Any help would be greatly appreciated.