How do I prevent exchange server 2013 from routing email from other exchange servers?

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?

thank you
cyberleo2000Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
I am not too sure what you are trying to accomplish here but all you should have to do is stop/disable the Mailbox Transport Delivery and Transport Submission Services.

I guess you could also try setting up firewall rules on these servers as well but the easiest way would be to disable those services I mentioned.

Will.
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cyberleo2000Author Commented:
I don't want these serves used to relay email from other servers in my organization. When I built one, I saw email queueing where the source and target were not this server. I have turned off the transport service, but once I begin adding mailboxes to it I'll need to turn the transport service back on so those mailboxes can send and receive.
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cyberleo2000Author Commented:
I don't want these servers to act as relays for other servers.
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Simon Butler (Sembee)ConsultantCommented:
Exchange uses all resources available to it. That means all email will be routed through all servers with the transport role/functionality. That provides you with resilience in the event of a server failure.

Of course that can mean that an email between two users on server 1 could go through server 2, but that doesn't really matter.

You are trying to go against how Exchange is designed to work, so what you want to do is not possible.
It isn't relaying either, it is simply the servers being used to transport the email.

Simon.
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Will SzymkowskiSenior Solution ArchitectCommented:
As Simon stated this is not relaying it is a core mechanism that Exchange uses to ensure the email gets delivered to the mailbox.

Will.
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cyberleo2000Author Commented:
The other servers in the site are mailbox\hub transport as well and I have confirmed that they will pickup email to and from mailboxes on the servers where I have disabled the transport service.

thank you for you help.
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