I have an issue with a client that I'm not sure how to approach. The client wants to move away from Postini to GFI to filter email. We setup the new service and made all the changes on the firewall to accept smtp traffic from GFI however when we run the SMTP tests we are getting through the firewall but the server is not responding to the SMTP requests.
With Postini if we run an SMTP test pointing to the same IP addres of the clients Exchange server which we put in GFI it seems to be working just fine. I pointed GFI to our own Exchange server and it does connect and acknowledges SMTP commands.
So my question is on Exchange 2010 is there anywhere that I might need to set what IP addresses or hosts it would accept email from? I didn't setup this Exchange environment but wanted to see if there are settings i'm missing. Thanks for the help