[exim] LDAP second level queries?

I've googled a bit around but i've not found relevant info.


I need to do ''second level'' or ''nested'' ldap queries, because i need to
found user in a ''group of names'' (really: an AD LDAP server).

So, a first query have to return DNs for every member in a group, and a
second query have to extract UID fron the DNs.


How can achieve that? Thanks.

-- 
  ...il ponte di Messina unirà «non due coste ma due cosche».
                            (Niki Vendola)