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

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..
bankadminAsked:
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Jason CrawfordExchange / Office 365 Premier Field EngineerCommented:
You can create transport rules for senders inside/outside the organization:

https://technet.microsoft.com/en-us/library/dd638183(v=exchg.150).aspx#Senders

with an action of prepending the subject with text of your choice:

https://technet.microsoft.com/en-us/library/aa998315(v=exchg.150).aspx
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viktor grantExchange ServersCommented:
Hi,

As above Jason told you..the best way it will be to create a transport rule in Exchange Console.

Cheers
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bankadminAuthor Commented:
Thanks sorry for the slow reply
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