On 11/29/2015 02:54 PM, John R Levine wrote:
The SMTP received header only shows the IP of the mail servers, not of
the user. In approximately 100% of cases, the location of the mail
server is not interesting, and tells you nothing about the location of
the user. For example, on your message to which I'm replying:
Received: from mercury.scss.tcd.ie (mercury.scss.tcd.ie [134.226.56.6])
by mail1.iecc.com ([64.57.183.56]) with ESMTPS (TLS1.2/X.509/AEAD) via
TCP port 34923/25 id 563408838; 29 Nov 2015 22:38:49 -0000
Not 100%. Contrast that with the message I sent to the list a few
minutes ago:
Received: from v2.bluepopcorn.net (v2.bluepopcorn.net [IPv6:2607:f2f8:a994::2])
(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
(No client certificate requested)
by ietfa.amsl.com (Postfix) with ESMTPS id 1551C1B3847;
Sun, 29 Nov 2015 14:53:43 -0800 (PST)
Received: from [IPv6:2001:470:1f05:bfe:a06d:6a7c:4078:aebf]
([IPv6:2001:470:1f05:bfe:a06d:6a7c:4078:aebf]) (authenticated bits=0)
by v2.bluepopcorn.net (8.14.3/8.14.3/Debian-9.4) with ESMTP id tATMrfPA024552
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO);
Sun, 29 Nov 2015 14:53:42 -0800
v2.bluepopcorn.net is my MSA; it also reported the IP address of my home
Linux machine, running Thunderbird, that I'm sitting directly in front of.
-Jim
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