16.13. Securing the Mail Server
The mail server in Mac OS X Server has a few settings designed specifically for security. In Chapter 7 we discussed using the SpamAssassin and ClamAV features to limit mail that SpamAssassin and ClamAV identify as potentially sent from a spammer or system that has been infected with viruses. But what if your server is hijacked and set up as an open relay used to send spam? An open relay is a server that allows any user to relay mail through it. To verify your system isn't being used as an open relay, open Server Admin and click on the Mail service in the SERVERS list. From here, click on the Relay tab and remove any addresses that are not in your local network from the Accept SMTP Relays from These Hosts and Networks ...
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