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Exchange 2010 SP2 SMTP routing out both CAS servers

Posted on 2014-12-15
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We have an Exchange 2010 SP2 environment with 2 Exchange servers running Hub Transport, Client Access roles; 2 Exchange servers running Mailbox Role.  We recently moved all the servers into one site for audit/security purposes.  My question is:  when moving these offsite, I noticed that email flows outbound through either CAS server.  Is this by design automatically to load balance the traffic between the CAS servers when the servers are at one site?
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Question by:trinity2007
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Simon Butler (Sembee) earned 2000 total points
ID: 40501477
First - Exchange 2010 SP2 is no longer supported. You need to upgrade to Exchange 2010 SP3 to remain supported. If you are trying to pass auditing, then you will fail being on an unsupported environment.

Exchange will route email out through all servers with the hub transport role that are listed in the source server on the send connector. Even internally all servers in the same AD site will be used. Therefore if you have two users on the same mailbox database it isn't unusual to see their email pass through another server completely.

Remember as far as Exchange is concerned, the roles are independent of each other. When sending email it looks for a hub transport server, not necessarily the same one it has the mailbox role on. Exchange is only interested in the AD site boundary.

Simon.
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by:trinity2007
ID: 40501518
We are in the process of setting a timeline to get our Exchange servers up to date.  I noticed that we do have both servers in our Send Connector.  I thought that was why it was going through both servers, just needed verification.
Thank you for your comments.
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