THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Unfortunately there's limits to what one can automatically discover about a network from just email headers.
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It's pretty obvious that any \[http://tools.ietf.org/html/rfc1918|RFC 1918\] (which obsoleted \[http://tools.ietf.org/html/rfc1597|RFC 1597\]) private IP's in the most recent Received: header are part of the local network. From there, tracking backwards in terms of time, each additional private IP can be safely assumed to be a part of the local network until you hit the first non-private IP. |
The problem is how can you tell if that first non-private IP is part of the local network? You can't.
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