J_K7,

Also, does the following bit of the header mean that the sender was in the GMT-7 time zone?
Code:
Received: from smtp12.wanadoo.fr (smtp12.wanadoo.fr [193.252.22.20])
by mx.gmail.com with ESMTP id a2si1016358rnf.2005.09.01.13.39.14;
Thu, 01 Sep 2005 13:39:15 -0700 (PDT)
I would be tempted to say that it was received at 13:39 Pacific time by the Gmail server. And I just checked on Gmail, and that's the case. The header tells you when the email was received by your mail server, and it includes the time settings for that mail server.

So no, it doesn't say anything about the sender's timezone.

Cheers,

BrainStop