I have next situation. We manage a large enterprise Active Directory servers and also Exchange servers. We have a sofisticated Internet access schema with multiple DMZ's and security protection layers.
We have installed for the mail filtering, antispam function, virus checking, etc one product.
Also we have mail relay server that relay all incoming mails from outside to some mail servers from inside.
We hava a lot a virused email's that comes from Internet with spoofed destination address but with the correct domain name, so our Antivirus Mail gateway process these too. This product has capability to check the validity of destination user based of some LDAP connection and querry to Active Directory system. We want to export the list with the actual valid users from our company and import this list offline to the DMZ AD server .
How can we perfom this operation ?