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Home » Kerio User Forums » Kerio Connect » Can you help me to modify spamassassin rules to block some messages

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There is frontend relay mail server exist on our network.
Frontend server based on "microsoft smtp IIS 6 service" and therefore it is impossible to test messages using "Reverse DNS test" which comes with Kerio Mail Server.
Can You help me to modify Kerio Mail Server or spamassassin
rules which is under MailServer\plugins\spamassassin\rules to block messages with string contains this text "RDNS failed)
in header? is it possible?
i think it will be solution for me.

P.S. sorry for my bad english.

this is sample message which i want to block.

Return-Path: <munoz<_a.t_>>
X-Envelope-To: se<_a.t_>
X-Spam-Status: No, hits=4.3 required=9.0
tests=BAYES_99: 4.07,MIME_8BIT_HEADER: 0.3,TOTAL_SCORE: 4.370
X-Spam-Level: ****
Received: from localhost ([])
for se<_a.t_>;
Mon, 13 Oct 2008 14:13:12 +0600
Received: from [] ([] RDNS failed)
by with Microsoft SMTPSVC(6.0.3790.3959);
Mon, 13 Oct 2008 14:12:50 +0600
Message-ID: <000501c92d0b$012a9181$de74c3b5<_a.t_>mhmeh>
From: =?koi8-r?B?59LV2t7Jyy38y9PQxcTJ1M/S?= <munoz<_a.t_>>
To: <se<_a.t_>>
Subject: =?koi8-r?B?59LV2t7Jyy38y9PQxcTJ1M/S?=
Date: Mon, 13 Oct 2008 06:23:34 +0000
MIME-Version: 1.0
Content-Type: text/plain;
Content-Transfer-Encoding: 8bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2720.3000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300
Return-Path: munoz<_a.t_>
X-OriginalArrivalTime: 13 Oct 2008 08:12:51.0361 (UTC) FILETIME=[7C82D910:01C92D0B]

[Updated on: Mon, 13 October 2008 10:49]


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You can just set this up in your SPAM filter settings from within the admin console.

Just add a Custom Rule with Header recieverd, and look for "RDNS failed" in the substring.

Good luck
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