Yahoo spam | Joachim De Zutter
December 2012

In gmail it is possible to view the full e-mail headers of an e-mail message by clicking show original after clicking the down arrow next to reply.

Examples of header fragments received from a yahoo e-mail account that was probably compromised and used to send unsolicited bulk e-mail (spam) to all mail addresses in the contact list:
Received: from [83.29.222.156] by web141104.mail.bf1.yahoo.com via HTTP; Sun, 09 Dec 2012 01:44:52 PST
Subject: FW:Hello!

Received: from [118.101.131.51] by web141105.mail.bf1.yahoo.com via HTTP; Sat, 08 Dec 2012 07:08:38 PST
(no subject)

Received: from [190.161.198.157] by web141106.mail.bf1.yahoo.com via HTTP; Thu, 06 Dec 2012 09:10:11 PST
(no subject)
http://www.utrace.de/?query=83.29.222.156
Provider: Neostrada Plus, Region: Kraków (Poland)

http://www.utrace.de/?query=118.101.131.51
Provider: Telekom Malaysia Berhad, Region: Kuala Lumpur (Malaysia)

http://www.utrace.de/?query=190.161.198.157
Provider: Provider: VTR Banda Ancha S.A., Region: Vina Del Mar (Chili)

In December 2013, someone performed email spoofing:
Authentication-Results: hotmail.com; spf=none (sender IP is 64.59.134.12) smtp.mailfrom=[...]@yahoo.com; dkim=none header.d=yahoo.com; x-hmca=none header.id=[...]@yahoo.com
Received: from smtp-out-04.shaw.ca ([64.59.134.12]) by SNT0-MC3-F13.Snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
	 Tue, 24 Dec 2013 19:27:12 -0800
Received: from unknown (HELO shaw.ca) ([113.160.151.107])
  by smtp-out-04.shaw.ca with ESMTP; 24 Dec 2013 20:27:08 -0700
Subject: Good afternoon!
Date: Wed, 25 Dec 2013 04:27:04 +0100
X-Mailer: Microsoft Office Outlook 11
X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609
Return-Path: [...]@yahoo.com
X-OriginalArrivalTime: 25 Dec 2013 03:27:12.0567 (UTC) FILETIME=[3371AC70:01CF0121]
[...]
http://cozumkonusmak.com/halisaha/hotnews.php?xrzmhzbefe1122pvg
[...]
------------[...]
Communism is the most painful path from capitalism to capitalism.[...]
http://www.utrace.de/?query=113.160.151.107
Provider: VDC
Organisation: Vietnam Posts and Telecommunications(VNPT)
Region: Hanoi (VN)