Mail flow question

I have a stupid question, since there is no more hub transport role in Exchange 2013 I'm trying to figure out which role sends and receives email. I am going to put the CAS Role on one server and the Mailbox Role on the other server and just need to know
which server would be responsible for sending and receiving email.
Vincent Sprague

Hi Baron,
I recommend you refer to the following article to understand the receive connectors on different exchange roles:
http://technet.microsoft.com/en-us/library/aa996395(v=exchg.150).aspx
Default Receive connectors created on a Mailbox server running the Transport service
When you install a Mailbox server running the Transport service, two Receive connectors are created. No additional Receive connectors are needed for typical operation, and in most cases the default Receive connectors don't require a configuration change.
These connectors are the following:
Default <server name>   Accepts connections from Mailbox servers running the Transport service and from Edge servers.
Client Proxy <server name>   Accepts connections from front-end servers. Typically, messages are sent to a front-end server over SMTP.
Each connector is assigned a TransportRole value. You can use it to determine the role the connector is running in. This can be helpful in cases where you are running multiple roles on a single server. In the case of each Receive connector previously
mentioned, their TransportRole value is HubTransport.
To view the default Receive connectors and their parameter values, you can use the
Get-ReceiveConnector cmdlet.
Default Receive connectors created on a Front End Transport server
During installation, three Receive connectors are created on the Front End transport, or Client Access server. The default Front End Receive connector is configured to accept SMTP communications from all IP address ranges. Additionally, there is a Receive
connector that can act as an outbound proxy for messages sent to the front-end server from Mailbox servers. Finally, there is a secure Receive connector configured to accept messages encrypted with Transport Layer Security (TLS). These connectors are the following:
Default FrontEnd <server name>   Accepts connections from SMTP senders over port 25. This is the common messaging entry point into your organization.
Outbound Proxy Frontend <server name>   Accepts messages from a Send Connector on a back-end server, with front-end proxy enabled.
Client Frontend <server name>   Accepts secure connections, with Transport Layer Security (TLS) applied.
In a typical installation, no additional Receive connectors are required.
Best regards,
Niko Cheng
TechNet Community Support

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