How to block certain external users?

We've just deployed Lync 2013 with an Edge server. I have federation working with Skype and with our internal Video Conferencing equipment. I'm able to setup Skype users so they can call our Video equipment directly. Is there a way to block certain
email addresses or domains (like @outlook.com), from making a call to a Lync user? 

At an administrative level, under Federation and External Access - > SIP Federated Domains, you can add a new Blocked Domain, however if it's Skype it may not work as these addresses will come in a bit differently than a normal federated domain. 
At a user level, you could add them to the user's contact list and right click to change the privacy relationship to blocked.
For a single contact, you can't really apply this at an administrative level for all users.
At a user level you can't really do this to block an entire domain.
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SWC Unified Communications

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