Outlook email and IP address

we have users who has the access to terminal server and their PC's desktop.
i am trying to find out whether they send an email from the office or connecting their PC from  outside?
i know the message header list if an outsider send an email.
but for the internal users , it does not list the IP.
  If someone from the office sends me an email, am I able to tell if it was sent from the office, or if they used the remote connection?  
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A Terminal Services session is identical to most user-mode applications to running them on the local display (the only ones that see the difference are any video-intensive apps that use the graphics driver). In other words, Outlook won't know.

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pdsmicroAuthor Commented:
is there any otherway we can findout that this remote nuser physically in front of his computer?
You can check the security logs on the terminal server assuming they are logging into a Terminal Server and not their desktops. Is that hte case?
pdsmicroAuthor Commented:
Thank you for your help.
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