Preventing GAL photos being sent to internet recipients

Good Afternoon,

Recently we started loading thumbnail photos into AD for use with outlook, lync, sharepoint,etc...  While our users are enjoying this feature there are some that have concerns of their pictures being sent to email addresses outside our organization.  My question is if there is a way to prevent these thumbnail photos from being sent to internet users and only allow to be seen internally.  I'm not sure if this is an outlook option or an option that can be set on exchange.  Any assistance would be appreciated.

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This should only be set up in Active Directory and only visible to anything that queries it. Without knowing more about how you are getting your thumbnails set up it's hard to say 100% but you could test by sending to a hotmail account or something? Also check the email sizes on the outbound side and see if they correlate to having an image attached.
mkllpitAuthor Commented:
Found the answer according to MSFT from

Q. When users send an email to external recipients, are photos sent outside my organization?
A. No, the thumbnail photos are not sent with email. As indicated above, Outlook 2010 clients in your organization fetch the data from Active Directory (or the Offline Address Book, if you've modified the ConfiguredAttributes parameter for the OAB to include it as a value attribute). If your Active Directory is accessible to anonymous users from outside the organization, meet me at camera 2! :)

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mkllpitAuthor Commented:
Found answer from Microsoft
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