[Exim] LDAP Authentication.

I'm trying to get authentication to work, and the AUTH documents are very
vague on the subject of AUTH in general.

My uid=$local_part,ou=People,dc=mydomain,dc=com has a unix-md5 userPassword,
as well as cleartext clearPassword (for CRAM-MD5, and DIGEST-MD5), and I'm
trying to setup PLAIN, LOGIN, CRAM-MD5, and SPA, all my using LDAP for
password comparison.

I tried initially over PAM, but for some reason, PAM is trying to bind the uid
over to authenticate the password, and failing.

Eric Renfro