Question: How can I configure the Mail Server to provide SMTP services without becoming an open relay? Answer All versions of the Apple Mail Server prior to 10.1.3 are considered an open relay. Version 10.1.3 introduced an improved mail server that allows you to control who can send what through your server. It does this through a combination of SMTP Relay restrictions and newly added SMTP AUTH capabilities. You can find more information in these Knowledgebase articles: 106760: "Mac OS X Server: How to Set up SMTP Authentication" 106761: "Mac OS X Server: About SMTP Authentication for Apple Mail Server" 106762: "Mac OS X Server: How to Set up Restricted SMTP Relay for Apple Mail Server" 106761: "Mac OS X Server: About SMTP Authentication for Apple Mail Server"

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