Yes it can. During the installation indicate that you are configuring as a relay. You will see this question.
You then should follow the "appliance" integration instructions for Zimbra in order to ensure that inbound, outbound etc. email from your ZCS box uses your new appliance.
Cheers


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By the way, we would greatly appreciate any feedback from those who have tested mxHero. Anything you think we should focus on, etc. You can email me at apanagides (at) users.sourceforge.net

