email with Tor

["Ben Clifford" <rhodopsin@xxxxxxxxxxx>]

Dear all,

I am using Tor to hide what country I am in when in email contact. Each time 
I email - I will be emailing with a different IP (most probably), 
originating to a range of countries - so they will not see a single country 
- my country of origin. The problem comes if they look at the email headers 
of my different emails: below I have cut and paste a part of the email 
header:

Received: from hotmail.com ([65.54.229.28]) by mc12-f31.hotmail.com with 
Microsoft SMTPSVC(6.0.3790.211); Mon, 17 Oct 2005 05:48:40 -0700

It has time zone information in it: -0700. From this they can infer what 
area of the world I am in. My Ip will change accross the different emails - 
my country will seemingly change across the different emails (they will 
infer I am using some proxy service - my country couldn't possible change 
that often). But the time zone reveals my actual area of the world. I think 
the time zone info will be constant accross the different emails (the IP 
will change tho). Is there any way around this? Am I interpreting things 
right? I hope that someone can understand what I am on about. Kind regards,
rhodo