Exchange 2013 email flow

We migrated Exchange 2007 to Exchange 2013.  How can I verify internal email isn't going outside the organization, then coming back in when it's just an internal email?

Is there a PS cmd I can run to trace the route an email is taking?
BMFCAsked:
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FarWestCommented:
you can view the Internet message headers from "message options" in outlook
and verify that no public IP is there
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ChrisCommented:
Fryezz' solution is probably the quickest method for this. If you find it difficult to understand the headers, copy and paste them into this website and it will format them for you in an easily understandable fashion.

http://mxtoolbox.com/EmailHeaders.aspx
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BMFCAuthor Commented:
Both solutions provided the answer.  Thanks
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