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Running Exchange 2010. Looking for a solution where we can set up a few users with email addresses that can only send and receive internally and to one external vendor that we work with. We want to not allow them to send/receive to anything else. <br />
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Is this possible to do through just exchange 2010?
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Running Exchange 2010. Looking for a solution where we can set up a few users with email addresses that can only send and receive internally and to one external vendor that we work with. We want to not allow them to send/receive to anything else. 

Is this possible to do through just exchange 2010?

Control Mailflow for Specific Users with Exchange

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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.