We have a single user getting targeted by a spam wave, almost seems like a DDoS attack on her mailbox. Emails are coming from legitimate servers, seeing a lot of GoDaddy, et al, so not able to use a new RBL probably. It looks like they are probably from infected web servers to be honest. We currently run Cyren Anti-Spam, and have the spam assassin filter. Below is an example:
Return-Path: <webmaster@bojler.by>
Received: from orion.localdomain (customer.worldstream.nl [109.236.90.65]) by smartermail.truenet.com with SMTP
(version=TLS\Tls12
cipher=Aes256 bits=256);
Fri, 11 Mar 2016 08:51:32 -0500
Received: by orion.localdomain (Postfix, from userid 33)
id 92AB7D89B; Fri, 11 Mar 2016 16:51:53 +0300 (MSK)
To: user@domain.com
Subject: bk83MOaR0hpB19BilhfAJPTRYUIn toKCmDf1EV1Kbs 0RJlXOJyvvflgNxP
X-PHP-Originating-Script: 33:config-file-settings.php
MIME-Version: 1.0
Content-type: text/html; charset=UTF-8
From: OZxu5@AYyA4XaUwB.cz
Message-Id: <20160311135153.92AB7D89B@orion.localdomain>
Date: Fri, 11 Mar 2016 16:51:53 +0300 (MSK)
X-CTCH-RefId: str=0001.0A010205.56E2CD80.008E,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0
X-CTCH-AVLevel: Unknown
X-SmarterMail-Spam: Commtouch 5 [value: Unknown], ISpamAssassin 0 [raw: 0], SPF_None, DK_None, DKIM_None
X-SmarterMail-TotalSpamWeight: 5
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