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Although most Apple OS X users don't use Apple's Mail Server (and don't need to), it is very important that if you do use it, you use a secure version. We've seen at least one UO user running a version of Apple Mail Server older than 10.1.3. Please note that Apple's Mail Server prior to 10.1.3 is insecure and vulnerable to SMTP relay abuse by spammers, and must be upgraded. More information about this is available at http://docs.info.apple.com/article.html?artnum=106763
For general information on how to update your Apple OS X system's software, please see http://docs.info.apple.com/article.html?artnum=106704. Or, go to System Preferences in the Apple Menu, select Software Update, and click on Check Now. While you're there, make sure you've got "Automatically check for updates when you have a network connection" and the "Daily" option selected.
Information on configuring Mac OS X Server Mail service to prevent open SMTP relay is available at http://docs.info.apple.com/article.html?artnum=107344
Note: Apple Mail Server is an optional feature of OS X and is not part of the default installation.