How to lock down the IP addresses allowed to connect to our Exchange 2010 server?
Posted on 2016-08-09
It is possible for an attacker to bypass our Spamtitan protection service by sending emails directly to our Exchange server rather than sending to the host specified by our DNS MX records. I understand there is a way to restrict using firewall. Besides using firewall, can we use the Receive Connectors where we can put the Spamtitan's ip address? It is in the Network tab / "Receive mail form remote servers that have these IP addresses:"