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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:
1 In Server Admin, select a computer in the Servers list, then select Mail.
2 Click Settings.
3 Select the Advanced tab.
4 Select Security.
5 Select CRAM MD-5 or Kerberos (as needed) in the IMAP section.
6 Click Save.
To set less secure IMAP and POP authentication:
1 In Server Admin, select a computer in the Servers list, then select Mail.
2 Click Settings.
3 Select the Advanced tab.
4 Select Security.
5 Click the Login, PLAIN, or Clear checkbox in the IMAP list.
6 Click Save.
If you use the Server Setup Assistant and make your server and Open Directory Master,
Kerberos, CRAM-MD5 (for IMAP), and APOP (for POP) are enabled automatically. If you
want to force only one method to be used for authentication, deselect the one you do
not want used.
66 Chapter 3 Mail Service Advanced Conguration