I won't get into the specifics, but I know a lot about tracing emails and such, and gmail is almost impossible to get IP info off of via headers. Really the only way to get the IP of a gmail originating email is to have set up via a readnotify service that can do it an alternate way.
Right clicking on the header and all of that won't do it with gmail, nor the normal other methods of tracing email. It's not something you can "back trace" either to set up the service and THEN figure it out. It'd only work if that was set up and THEN another email came.
Hope that helps.


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