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I'm thinking some kind of Transport Rule could accomplish this.<br />
<br />
<a href="http://waysaroundit.co.uk/2011/09/using-exchange-transport-rules-to-prevent-recipients-from-replying-to-or-forwarding-a-message/" rel="ugc">http://waysaroundit.co.uk/2011/09/using-exchange-transport-rules-to-prevent-recipients-from-replying-to-or-forwarding-a-message/</a>
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I'm thinking some kind of Transport Rule could accomplish this.

http://waysaroundit.co.uk/2011/09/using-exchange-transport-rules-to-prevent-recipients-from-replying-to-or-forwarding-a-message/ [http://waysaroundit.co.uk/2011/09/using-exchange-transport-rules-to-prevent-recipients-from-replying-to-or-forwarding-a-message/]

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Hello, <br />
<br />
Im trying to find a way to block attachments from being forwarded outside the company. &nbsp;We want users to have to create a new email if they wish to send an attachment they have gotten outside the company. <br />
<br />
Thank you,<br />
Rob
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Hello, 

Im trying to find a way to block attachments from being forwarded outside the company.  We want users to have to create a new email if they wish to send an attachment they have gotten outside the company. 

Thank you,
Rob

Exchange 2010 -  Block attachments from being forwarded out side the company.

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.