You can prevent users from using your site to host and relay messages to recipients that are not in your organization. Messages that were intended to be relayed are instead returned to the sender as non-deliverable.
For example, if you want to only allow messages sent from the domain xxx.com to be relayed through your site, you can add that domain name to the Specify the hosts and clients that can route mail when the following conditions are met list. The Internet Mail Service will allow mail sent from the xxx.com domain to be relayed through your site, but will not allow mail sent from any other domain to be relayed.
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To restrict message relaying |
| Option | Description |
|---|---|
| Hosts and clients that successfully authenticate | Messages sent from hosts and clients with valid logon information are relayed. |
| Hosts and clients with these IP addresses | Messages sent from the specified IP addresses are relayed. |
| Hosts and clients with these internal addresses | Messages sent by hosts and clients that connect to the specified IP address on the Microsoft Exchange Server computer are relayed. Allows multi-homed servers to restrict relaying based on the IP address to which the client connects. If you choose this option, you must disable IP forwarding on the Networking property pages in Control Panel. |
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To disable message relaying |