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.