I understand that in exchange 2013 a mailbox server is also a hub transport server. I am building three exchange 2013 mailbox servers without the CAS role. I am going to configure an IP-less DAG using these three servers. I have other exchange 2013 and exchange 2007 servers in my environment. How do I prevent these three new servers from routing email from mailboxes in other servers?
example: I have servers 1 thru 10. I am building servers 11,12 and 13. How do I prevent email from a mailbox on server 1 sent to a mailbox on server 10 from routing through servers 11,12 or 13? Is this possible?