[exim] Using Exim and Query User Database From LDAP server

Hi Everybody,

            I have a mail server which have many  domains and many users on
it. I'm using exim like a ETRN/Backup Server for if some reason first mail
server die exim collect mails this ok. But problem is if first mail server
die then I will accept all fake mails , I should make check recipents mails
fake or not . My mail server support LDAP  for this reason I can export
domain and account list to any ldap server . My question is How can I make
ldap query with exim for check recipents available or not ? or Can I make it
, I know if I install exim with ldap support I can store my account on ldap
server but my request is exim will make a ldap query for accepting recipents
available or not on LDAP server .. 

You can find out my domains LDIF Export ... Any advise ? or Knowledge about
this ? because I don't know really What I need as for me I will install
exim with ldap support but extra I think I have set LDAP server and say exim
to make a recipents control from LDAP.

Thanks
Best Regards
Vahric

dn: uid=user1,cn=ipekcik.com
objectclass: top
objectclass: person
objectclass: organizationalPerson
objectclass: inetOrgPerson
objectclass: CommuniGateAccount
cn: none
hostServer: localhost.localdomain
sn: none
uid: user1
mail: user1@???

dn: uid=user2,cn=ipekcik.com
objectclass: top
objectclass: person
objectclass: organizationalPerson
objectclass: inetOrgPerson
objectclass: CommuniGateAccount
cn: none
hostServer: localhost.localdomain
sn: none
uid: user2
mail: user2@???

dn: uid=user1,cn=another.com
objectclass: top
objectclass: person
objectclass: organizationalPerson
objectclass: inetOrgPerson
objectclass: CommuniGateAccount
cn: none
hostServer: localhost.localdomain
sn: none
uid: user1
mail: user1@???

dn: uid=user2,cn=another.com
objectclass: top
objectclass: person
objectclass: organizationalPerson
objectclass: inetOrgPerson
objectclass: CommuniGateAccount
cn: none
hostServer: localhost.localdomain
sn: none
uid: user2
mail: user2@???