A number of my friends who use Yahoo.com email addresses have been frustrated by spam emails that appear to be sent through their accounts. A look at the actual email headers reveals the emails do not actually originate from Yahoo:

Return-Path: yahoouser@yahoo.com
X-Original-To: Mark Turner
Delivered-To: Mark Turner
Received: from smtprelay.b.hostedemail.com (smtprelay0206.b.hostedemail.com [64.98.42.206])
by maestro.markturner.net (Postfix) with ESMTP id 9E6FEC81102
for Mark Turner; Sat, 29 Mar 2014 05:13:05 -0400 (EDT)
Received: from filter.hostedemail.com (b-bigip1 [10.5.19.254])
by smtprelay01.b.hostedemail.com (Postfix) with ESMTP id 9EE0D2D2A15;
Sat, 29 Mar 2014 09:13:06 +0000 (UTC)
X-Session-Marker: 536861776F6F64406265782E6E6574
X-Spam-Summary: 10,1,0,,d41d8cd98f00b204,,:::::::::::::::::::::::::::::::::::::::,RULES_HIT:41:72:355:379:539:540:541:542:543:590:962:96
X-HE-Tag: pets27_36a824eacc042
X-Filterd-Recvd-Size: 2630
Received: from bex.net (unknown [122.166.148.93])
(Authenticated sender: Shawood@bex.net)
by omf06.b.hostedemail.com (Postfix) with ESMTPA;
Sat, 29 Mar 2014 09:12:55 +0000 (UTC)
Message-ID: 120dcf1f0409$188b32c6$8c62fe50$@yahoo.com
From: Yahoo User yahoouser@yahoo.com

… but the damage is done. Continue reading →