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Hi,<br />
<br />
As above Jason told you..the best way it will be to create a transport rule in Exchange Console.<br />
<br />
Cheers
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Thanks sorry for the slow reply
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Running 2013 exchange on 2012R2, We would like to add a &quot;message&quot; to emails that will let the end users know if the email is from internal account or a external account..
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Running 2013 exchange on 2012R2, We would like to add a "message" to emails that will let the end users know if the email is from internal account or a external account..

add a message on all emails stating whether its internal or external

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.