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I have Exchange 2007 installed on a W2k8 box with two NICs. How can I tell Exchange to route all outgoing SMTP traffic out via a specific NIC?

Edit: Can I do it via the W2k8 firewall/routing?

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Maybe using differents metrics in your nic configurations – Maxwell Aug 12 '09 at 12:59
Problem being that I want almost all other traffic to go via main NIC. The NIC I want to use for SMTP will actually have higher metric... – Marius Aug 12 '09 at 13:03
up vote 1 down vote accepted

This can only be performed on the Edge Transport server according to Microsoft, so I am not sure if it will work on a Hub that is also handling Edge traffic.

Use the following PowerShell command to set the source IP:

Set-SendConnector "Connector Name" -SourceIPAddress a.b.c.d

More information is available on the Set-SendConnector command here.

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Check this blog out: It explains how you have to do this through the Exchange Management Shell.

Please note the following:

However, as noted in the documentation, this only works on Edge Transport servers. Hub Transport servers ignore the SourceIPAddress parameter.

Hope this helps.

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