The Exchange Server can be used as a relay for inbound and outbound SMTP traffic. For maximum security, you should use Exchange 2000 as the endpoint server in your organisation with the Message Screener installed on this computer. In this case, configure the relay option to allow only computers and domains in your organisation.
To configure the relay option for Exchange Server
- To open the Internet Services Manager, click Start, click Programs, click Microsoft Exchange, and then click System Manager.
- In the console tree of System Manager, click System Manager, click Servers, click the applicable server, and then right-click Default SMTP Virtual Server.
- Click Properties.
- On the Access tab, click Relay.
- In Relay Restrictions, select Only the list below. Add the computers and domains in your organisation.
If you are using other mail servers for client mail boxes, the server with the message screener (virtual SMTP server) should be configured to route the SMTP traffic to those servers. For more information on routing configuration, refer to Microsoft SMTP Service in Microsoft Windows Help.
