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The IP Address ranges on your Receive Connectors determine which systems can send mail to your Exchange Server. If you remove the internal network's IP range from the list of IP addresses on your Receive Connectors for port 25, it will prevent the Exchange Server from accepting mail from those clients. In order to send mail from an internal server to your exchange server, they'll have to ask for approval.
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The IP Address ranges on your Receive Connectors determine which systems can send mail to your Exchange Server. If you remove the internal network's IP range from the list of IP addresses on your Receive Connectors for port 25, it will prevent the Exchange Server from accepting mail from those clients. In order to send mail from an internal server to your exchange server, they'll have to ask for approval.

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OK, so I currently have 3 connectors on my Hub/CAS server. &nbsp;They are as follows:<br />
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Client <i>ServerName</i> - Presume this is used by Outlook clients<br />
Default <i>ServerName</i> - Presume this is the connector I need to modify<br />
Relay Connector - This has all the machines that need relay access<br />
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My only concern is knowing what other machines are using this Default connector so I can make sure to list every IP needed. &nbsp;Do my other Exchange servers use this connector (2003 boxes and Edge)?
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OK, so I currently have 3 connectors on my Hub/CAS server.  They are as follows:

Client ServerName - Presume this is used by Outlook clients
Default ServerName - Presume this is the connector I need to modify
Relay Connector - This has all the machines that need relay access

My only concern is knowing what other machines are using this Default connector so I can make sure to list every IP needed.  Do my other Exchange servers use this connector (2003 boxes and Edge)?

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The developers in our environment continue to point various servers to our production email server to send test emails. &nbsp;All of these emails stay internal, so they aren't relaying. &nbsp;Is there anyway to prevent them from doing this?
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The developers in our environment continue to point various servers to our production email server to send test emails.  All of these emails stay internal, so they aren't relaying.  Is there anyway to prevent them from doing this?

Exchange 2010 - Prevent internal machines from using as a smart host

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.