Verification failed on

From: Sistemisti Posta <>
Date: Wed, 27 Apr 2016 10:55:57 +0200

Hello OpenDKIM users,

  I'm evaluating OpenDKIM for mails coming from Internet to my domain. I
have a trouble in mail verification from

Some mails from this domain fail DKIM signature verification. For instance:

X-Spam-Status: No, score=-2.3 tagged_above=-999 required=4.5
         tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
         DSPAM_HAM_99=-0.5, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7,
         RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001,
         T_REMOTE_IMAGE=0.01] autolearn=disabled
Received: from
( [])
         by (MailFarm) with ESMTP id 3qtdRh1Y8wzFpVj
         for <>; Mon, 25 Apr 2016 09:40:16 +0200 (CEST)
DMARC-Filter: OpenDMARC Filter v1.3.1 3qtdRh1Y8wzFpVj
Authentication-Results:; dmarc=fail
Authentication-Results:; spf=fail
DKIM-Filter: OpenDKIM Filter v2.10.3 3qtdRh1Y8wzFpVj
         dkim=fail reason="signature verification failed" (1024-bit key) header.b=V1ZgZYnG;
         dkim=fail reason="signature verification failed" (1024-bit key) header.b=aSHkWdMg
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
         s=35pzb2tapqjxshkrupem4gpoke7mq3tm;; t=1461570015;
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
         s=ihchhvubuqgjsxyuhssfvqohv7z3u4hn;; t=1461570015;
Date: Mon, 25 Apr 2016 07:40:15 +0000
From: "" <>
         "" <>
Subject: Monica, la vetrina della settimana
MIME-Version: 1.0

I see that the "To" header field contains a "\r\n" after ":", I don't
know if this could be a problem.

OpenDKIM is the first milter in Postfix setup.

I also see that Spamassassin seems to validate the signature
(DKIM_VALID=-0.1). But it seems I can't use Amavis for writing AR
headers, because OpenDMARC refuses them :(

Could you give me any hints?

Thank you very much
Best Regards
Received on Wed Apr 27 2016 - 08:56:16 PST

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