[OKDXA] Spam or maybe "zombie" computers?

[RGA]

Hi folks,

Been rejecting sum e-mail posts to this list. Below is an example of the
rejects.

Bob k5sit 73

+++++++++++++++++++++++++++++++++++++++++++++++++++

Return-Path: <CassieSperger5857 at ttnet.net.tr>
X-Original-To: okdxa at mailman.qth.net
Delivered-To: okdxa at mailman.qth.net
Received: from ttnet.net.tr (unknown [95.8.70.117])
     by mailman.qth.net (Postfix) with ESMTP id 5A69E88248
     for <okdxa at mailman.qth.net>; Sat, 11 Dec 2010 08:01:20 -0500 
(EST)
From: Pfizer <noreply at pfizer.com>
To: okdxa at mailman.qth.net
Subject: okdxa at mailman.qth.net Pfizer -63% now
Mime-Version: 1.0
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: ISO-8859-1
Message-Id: <20101211130121.5A69E88248 at mailman.qth.net>
Date: Sat, 11 Dec 2010 08:01:20 -0500 (EST)