Part 1
Part 2
Part 3
Part 4
Now for the steps to allow a network application to relay while keeping your exchange server locked down.
Create a new recieve connector
Open exchange management console, under server configuration, hub transport click create a new recieve connector. Choose custom and provide the recieve connector with a name unique to identify it.
Configure the Local Network Settings
These settings specify what network adapters or IP's the recieve connector is to listen on as well as its FQDN to be used by the recieve connector.
Remote Network Settings
The remote network settings are the IP address, or addrsses that the network application is sending the mail from. This can be an IP range if you wish.
Create the New Connector
Hit new to create the new connector.
Set the Authentication
Next, continue to the authentication mechanisms page and add the "Externally secured" mechanism. What this means is that you have complete trust that the previously designated IP addresses will be trusted by your organization.
Set the Permissions
Set it up so only Exchange Servers have ACL permissions to read this recieve connector. These permissions are stored on the object container in the AD schema and are viewable by using ADSI Edit or powershell. Refer to the msexchange articles above for more information.
you spelled receive wrong numerous times, just sayin'
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