[Exim] ldap routing

I'm looking for some assistance with ldap routing.

Historically we have run a mail hub for the company and delivered mail to
each departments own mail servers, using @sub.domain addresses. Now
everyone is saying that they would like to have @domain addresses, while
continuing to use there local mail servers.

Being new to the exim configuration I was hoping to get some pointer on how
to set up our exim mail hub to do lookups on our ldap server to determine
the correct mail server to route an incoming message to.



William Gerken
WAN Engineer
Serco Information Systems