[Exim] Using LDAP

Good evening,

I'm sorry for my english but I'm tired.

I'm trying to use exim with LDAP, I think it is working but
exim don't find the user.
I think it's because I don't have a good structure in my
ldap annuary and I'm not looking for the good thing with
Exim.
If someone use exim with ldap, can he give me an exemple
whose working?

Thank you for your help.

Christophe.