If you are looking to store user’s SquirrelMail preferences in LDAP, I very strongly recommend Daniel Marczisovszky’s LDAP User Preferences Backend a.k.a. ldap_prefs_backend. It works flawlessly with OpenLDAP and is well documented. There are other such backends to SquirrelMail, such as the ldapuserdata plugin, but I’ve chosen the former for its ease of use.

LDAP, Mail, and Software :: 21 Dec 2005 :: e-mail