BTW, what is up with your emails coming in to the mailing list several hours earlier than what you replied to. It is getting annoying...
Don't know. The clock displayed in gnome is right to UTC and local.
I may have started with my using evolution rather that thunderbird. I have used evolution to post all my emails for the month of June.
You don't have your timezone set correctly, from your message:
Received: from [192.168.1.50] by lapu-lapu.bildanet.com with esmtp (Exim 4.68)
(envelope-from