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Before enabling Kerberos authentication for incoming Mail service, you must integrate Mac OS X with a Kerberos server. If you’re using Mac OS X Server for Kerberos authentication, this is already done for you.
Enabling multiple methods allows a client to use any of the enabled methods. If you want to require any of these authentication methods, enable only one method.
To set secure IMAP and POP authentication:
1In Server Admin, select a computer in the Servers list, then select Mail.
2Click Settings.
3Select the Advanced tab.
4Select Security.
5Select CRAM
6Click Save.
To set less secure IMAP and POP authentication:
1In Server Admin, select a computer in the Servers list, then select Mail.
2Click Settings.
3Select the Advanced tab.
4Select Security.
5Click the Login, PLAIN, or Clear checkbox in the IMAP list.
6Click Save.
If you use the Server Setup Assistant and make your server and Open Directory Master, Kerberos,
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Chapter 3 Mail Service Advanced Configuration