Has anyone checked the full email headers including IP addresses to see where they were sent from?
Don't know if this gives any indication or not:
Delivered-To:
[email protected]
Received: by 10.170.202.131 with SMTP id t125csp15428yke;
Sat, 12 Apr 2014 01:47:29 -0700 (PDT)
X-Received: by 10.180.104.161 with SMTP id gf1mr1790032wib.38.1397292449118;
Sat, 12 Apr 2014 01:47:29 -0700 (PDT)
Return-Path: <
[email protected]>
Received: from mailscan1.extendcp.co.uk (mailscan11.extendcp.co.uk. [79.170.45.20])
by mx.google.com with ESMTPS id e3si2224533wix.110.2014.04.12.01.47.28
for <
[email protected]>
(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Sat, 12 Apr 2014 01:47:29 -0700 (PDT)
Received-SPF: neutral (google.com: 79.170.45.20 is neither permitted nor denied by best guess record for domain of
[email protected]) client-ip=79.170.45.20;
Authentication-Results: mx.google.com;
spf=neutral (google.com: 79.170.45.20 is neither permitted nor denied by best guess record for domain of
[email protected])
[email protected]
Received: from lb1.hi.local ([10.0.1.197] helo=mailscan2.extendcp.co.uk)
by mailscan-fw192.hi.local with esmtp (Exim 4.80.1)
(envelope-from <
[email protected]>)
id 1WYtay-00013h-Iu
for
[email protected]; Sat, 12 Apr 2014 09:47:28 +0100
Received: from lb1.hi.local ([10.0.1.197] helo=mail40.extendcp.co.uk)
by mailscan2.extendcp.co.uk with esmtps (UNKNOWN

HE-RSA-AES256-GCM-SHA384:256)
(Exim 4.80.1)
(envelope-from <
[email protected]>)
id 1WYtax-0003Zk-Sq
for
[email protected]; Sat, 12 Apr 2014 09:47:28 +0100
Received: from smtp1-pl.ffm.fhe3rz.net ([82.98.86.203] helo=smtp1-pl.pl.ffm.fhe3rz.net)
by mail40.extendcp.com with esmtp (Exim 4.80.1)
id 1WYtax-0001lW-PF
for
[email protected]; Sat, 12 Apr 2014 09:47:27 +0100
Received: from sedoreals82.pl.i.sedorz.net (sedoreals82.pl.i.sedorz.net [10.0.6.53])
by smtp1-pl.pl.ffm.fhe3rz.net (Postfix) with ESMTP id 758D79B05
for <
[email protected]>; Sat, 12 Apr 2014 10:47:27 +0200 (CEST)
Received: by sedoreals82.pl.i.sedorz.net (Postfix, from userid 33)
id 70648A00471; Sat, 12 Apr 2014 10:47:27 +0200 (CEST)
To:
[email protected]
Subject: Confirm your Sedo Account
Date: Sat, 12 Apr 2014 10:47:27 +0200
From: Sedo <
[email protected]>
Reply-to:
[email protected]
Message-ID: <
[email protected]>
X-Priority: 3
X-Mailer: PHPMailer [version 1.73]
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="utf-8"
X-Spam-Score: 0.0
X-SpamFlt-Status: Not Detected
X-KASFlt-Status: Lua profiles 59621 [Apr 12 2014]
X-KASFlt-Status: Version: 5.0.1
X-KASFlt-Status: Rate: 0
X-KASFlt-Status: Status: not_detected
X-KASFlt-Status: Method: none
X-SpamFlt-Phishing: Not Detected