[exim] exim reading from samba?

I was hoping someone here could point me in the right direction. I am setting up an Active Directory domain using Samba, and I wanted to have exim check for mailboxes and passwords against samba's LDAP database. The idea is to synchronize everything into one location so that if I create a samba user dan, then I can login to windows, Linux, etc... and the email address dan@??? is automatically valid with the password I specified, allowing SMTP AUTH to succeed.

I appreciate any help you can give me.
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Dan Egli
>From my Test server