I am reviewing the Receive Connectors for a client and wanted to see how best we can lock down.
Environment is a single Exchange Server 2010 with all roles installed. The Default Connector is configured for 10.1.1.0/24 under Network > Receive Mail from ..... If I read this right, they should only have the IP Address of other Servers/Devices that send mail - not the IP Address range for local computers? So it should only list the IP Address of itself?
Please help - they are having issues being blacklisted and I think this may assist in denying client machines from sending mail. Assuming this does not preent client machines from using Outlook to send etc.