Hello all,

I've been receiving a lot of spam recently. I've enabled all three protocol checks under admin -> global settings -> MTA. Unfortunately, plenty of spam is still getting through, even though it looks to me as though it should be failing those protocol checks. Here are demo example headers:-

Code:
Return-Path: potionaccurate@eudict.com
Received: from 192.168.1.202 (LHLO <my.external.fqdn.host.name>)
 (192.168.1.202) by <mail.mydomain.org> with LMTP; Wed, 25 Sep 2013 20:16:55
 +1000 (EST)
Received: from localhost (localhost [127.0.0.1])
	by <my.external.fqdn.host.name> (Postfix) with ESMTP id 2938E606DB
	for <jon@mydomain.org>; Wed, 25 Sep 2013 20:16:55 +1000 (EST)
X-Virus-Scanned: amavisd-new at <mydomain.org>
X-Spam-Flag: NO
X-Spam-Score: 6.119
X-Spam-Level: ******
X-Spam-Status: No, score=6.119 tagged_above=-10 required=6.6
	tests=[BAYES_99=3.5, FSL_HELO_NON_FQDN_1=0.001,
	RCVD_IN_BRBL_LASTEXT=1.449, RCVD_IN_XBL=0.375, RDNS_NONE=0.793,
	TVD_SPACE_RATIO=0.001] autolearn=no
Received: from <my.external.fqdn.host.name> ([127.0.0.1])
	by localhost (<mail.mydomain.org> [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id z3dl2ZVAgqxg for <jon@mydomain.org>;
	Wed, 25 Sep 2013 20:16:53 +1000 (EST)
Received: from 286d59c429cd40f (unknown [5.143.196.76])
	by <my.external.fqdn.host.name> (Postfix) with SMTP id C891C606D1
	for <jon@mydomain.org>; Wed, 25 Sep 2013 20:16:45 +1000 (EST)
Received: (from root@localhost) by mail4.eudict.com (8.11.3/8.11.3)
 id k3V7OhN86972; Wed, 25 Sep 2013 10:16:52 -0300 (PDT envelope-from root)
Date: Wed, 25 Sep 2013 09:51:23 -0300
Message-Id: <53043801563038.lKxzWbDkHR@genitive>
X-Mailer: phpmailer [version 1.41]
X-BeenThere: esquire@mailman.eudict.com
X-Kaspersky: Checking 
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: <jon@mydomain.org>
From: "Free trial sample enlargement" <potionaccurate@eudict.com>
<SNIPPED>

I'm on version 8.0.4 FOSS. I'd appreciate any help on stopping the spammers.

Cheers,

Jon