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I saw that. I was trying to do it that way but couldn't figure out how. Can you provide step by step please?
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<a href="http://technet.microsoft.com/en-us/library/bb124737%28v=exchg.141%29.aspxhttp://technet.microsoft.com/en-us/library/bb124737%28v=exchg.141%29.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/bb124737%28v=exchg.141%29.aspxhttp://technet.microsoft.com/en-us/library/bb124737%28v=exchg.141%29.aspx</a><br />
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<a href="http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/using-transport-rules-to-moderate-messages-using-exchange-server-2010.html" rel="ugc">http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/using-transport-rules-to-moderate-messages-using-exchange-server-2010.html</a><br />
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Also Inbox rule can be set from outlook<br />
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<a href="http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/managing-inbox-rules-exchange-server-2010.html" rel="ugc">http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/managing-inbox-rules-exchange-server-2010.html</a>
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Worked like a charm, thank you. The part that I missed was creating the external contact before trying to build the rule.
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We want to block 2 external email addresses from being able to send to 1 specific user in our domain. We want those 2 external users to be able to send to other users in our domain however.
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We want to block 2 external email addresses from being able to send to 1 specific user in our domain. We want those 2 external users to be able to send to other users in our domain however.

Exchange 2010 external email blocking

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.