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Found answer from Microsoft
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Good Afternoon,<br />
<br />
Recently we started loading thumbnail photos into AD for use with outlook, lync, sharepoint,etc... &nbsp;While our users are enjoying this feature there are some that have concerns of their pictures being sent to email addresses outside our organization. &nbsp;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. &nbsp;I'm not sure if this is an outlook option or an option that can be set on exchange. &nbsp;Any assistance would be appreciated.<br />
<br />
Thanks!
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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.

Thanks!

Preventing GAL photos being sent to internet recipients

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.