Copy/paste from mailing list:
"On your page, in authentication, you are missing IMAP(S), it is a very good and simpler way to authenticate than LDAP. I just implemented it. It uses the same PEAR:Auth library."
IMAP Authentication Browse to Admin , Login , User registration and login set "Authentication Method" to Tiki and PEAR::Auth Click "Change preferences" at the bottom of the "User registration and login" section Browse to Admin , Login , PEAR::Auth set "Auth Type" to IMAP Set "IMAP/POP3/LDAP Host" to be the IP address or hostname of your IMAP server Set "IMAP/POP3/LDAP Port" to 143 Click "Change preferences" Done!