we have the following scenario:
There is just one single mail domain.
500 Mailboxes are on an Microsoft Exchange server with Active Directory, 500 Mailboxes are on a different server hosting POP3 Mailboxes.
Obviously I cannot use a LDAP Accept Query, as the AD doesn't have any knowledge about the POP3 mailboxes. The question is, can I still use LDAP for mailrouting, even if some account are not in the AD?