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
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

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.
cyberleo2000Author Commented:
I don't want these servers to act as relays for other servers.
IT Pros Agree: AI and Machine Learning Key

We’d all like to think our company’s data is well protected, but when you ask IT professionals they admit the data probably is not as safe as it could be.

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.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.

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.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.