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On our Zimbra 6.0.5 server running on Fedora 6, it seems that all messages are being tagged by spamassassin with NO_DNS_FOR_FROM (despite having legitimate sent addresses).

How should I debug this? It started happening today...

Example header:

Received: from (LHLO (NN.NNN.NN.NN) by with LMTP; Wed, 1 Sep 2010 07:10:44 -0500 (CDT)
Received: from localhost (localhost.localdomain [])
 by (Postfix) with ESMTP id 84983B90D2D
 for ; Wed,  1 Sep 2010 07:10:42 -0500 (CDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.851
X-Spam-Status: No, score=-1.851 tagged_above=-10 required=3.2
 tests=[AWL=-0.748, BAYES_00=-2.599, NO_DNS_FOR_FROM=1.496]
Received: from ([])
 by localhost ( []) (amavisd-new, port 10024)
 with ESMTP id 7rHCzaW15+sm; Wed,  1 Sep 2010 07:10:37 -0500 (CDT)
Received: from ( [])
 by (Postfix) with ESMTP id 0389EB90D24
 for ; Wed,  1 Sep 2010 07:10:37 -0500 (CDT)
Received: from (localhost.localdomain [])
 by (Postfix) with ESMTP id 6F52D93E596
 for ; Wed,  1 Sep 2010 05:10:31 -0700 (PDT)
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Subject: mailing list memberships reminder
X-No-Archive: yes
Date: Wed, 01 Sep 2010 05:09:29 -0700
Precedence: bulk
X-Mailman-Version: 2.1.12
X-List-Administrivia: yes
share|improve this question
Also at… – David Fraser Sep 1 '10 at 14:39 might be helpful in debugging: Use zmamavisdctl to stop amavis Then run: /opt/zimbra/amavisd/sbin/amavisd -c /opt/zimbra/conf/amavisd.conf debug – David Fraser Sep 1 '10 at 15:14
I'm currently suspecting this is due to transient/intermittent DNS failures; it is happening to some mails but not others – David Fraser Sep 3 '10 at 7:44
up vote 0 down vote accepted

This went away; I assume it was caused by DNS failures rather than problems in Zimbra itself

share|improve this answer
Set up a dedicated DNS resolver for the mail server. – cstamas Jan 3 '11 at 10:27

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