Route mails based on internal sender domain.

Hi All,
I have Hosted Exchange 2013 (1CAS and 1MBS) with the following domains. I already have an SMTP Send connector to route all mails (*) to a smart host.
DomainA.com
DomainB.com
DomainC.com
Now my requirement is - : I need to create an internet SMTP connector to route only mails from DomainC.com to use MX. How can it be configured or please let me know any other alternatives/best way.
Basically DomainC.com is for bulk emails, i need to outbound them through different IP.
Regards,
Vinod

I recommend that you post this in the Exchange for Hosters Forum: 
http://social.technet.microsoft.com/Forums/en-US/exchange2010hosters/threads
That's the forum for those who deal with multitenant configurations.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

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