Your company has four offices. Each office is configured as an Active Directory site.
You have an Exchange Server 2013 organization that contains nine servers. The servers are
configured as shown in the following table.
A user named User1 is in a distribution group named D_Sales. The mailbox of User1 is in a database
that is active on MBX4 and is configured to use MBX5 as an expansion server.
You need to ensure that email sent to D_Sales from the Internet is received by CAS1, and then
routed from MBX1 to MBX4.
What should you do?
A.
Configure Site1 as a hub site.
B.
Modify the expansion server setting of D_Sales.
C.
Modify the SubmissionServerOverrideList list on MBX1.
D.
Configure Site3 as a hub site.
The right answer is A: “If you want to force messages to go through Site A (Site1), you must enable that site as a hub site.”
Source: https://technet.microsoft.com/en-us/library/jj916681(v=exchg.150).aspx
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When the hub site exists on the least-cost routing path for message delivery, the messages queue and are processed by a transport server (MBX1) in the hub site (Site 1) before they are relayed to their ultimate destination (MBX4 on Site 3).
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I believe it’s: B. Modify the expansion server setting of D_Sales.
We only need to change the mail flow for D_Sales not all other traffic.
The Message Categorizer will send it to MBX5, so it can resolve the users that are part of the D_Sales lists and MBX5 forwards it’s to MBX4 for the user mailbox.
Source: https://technet.microsoft.com/en-us/library/aa998825%28v=exchg.150%29.aspx
Routing destinations
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In Exchange 2013, the ultimate destination for a message is called a routing destination. The following routing destinations exist in Exchange 2013:
• A mailbox database This is the routing destination for any recipient with a mailbox on a Mailbox server in the Exchange organization. In Exchange 2013, public folders are a type of mailbox, so routing messages to public folder recipients is the same as routing messages to mailbox recipients.
• A connector A connector is a Send connector for SMTP messages when used as a routing destination. A Delivery Agent connector or a Foreign connector is used as a routing destination for non-SMTP messages.
• A distribution group expansion server This is the routing destination when a distribution group has a designated expansion server that’s responsible for expanding the membership list of the group. A distribution group expansion server is always a Hub Transport server or an Exchange 2013 Mailbox server.
Note that these same routing destinations also existed in previous versions of Exchange.
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so which is the definite answer ??
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