[RCU] Continuing DKIM problems with RCM servers?

Drew Happli ahappli at havencomm.com
Sun May 9 19:47:56 CEST 2021


Most mailing list software due to various schemes to cut down on spam, 
have to modify the from.   Depending on how this is done some strict 
interpretations of DKIM/DMARC/etc could block or reject messages.

The Mailman Wiki has a lot of great information on it because Mailman is 
a widely used mailing list software.

https://wiki.list.org/DEV/DMARC

Drew.

(I always forget which e-mail address I am signed up on the Roundcube 
mailing list).

On 05/09/2021 6:34 am, Philip Rhoades wrote:

> People,
> 
> My mail server guru sent me the response below when I asked him about 
> getting error messages when I post to the RCM list - can someone tell 
> me if his analysis is correct?:
> 
> Thanks,
> 
> Phil.
> 
> -------- Original Message --------
> Subject: Re: FW: Re: [RCU] How to Host Multiple Mail Domains (Email 
> Hosting) in iRedMail Full Featured Linux Mail Server
> 
> Your mail got altered at the mail server that received kolabsys.com [1 
> [1]]?
> 
> Authentication-Results: ext-mx-in002.kolabsys.com [2 [2]] 
> (amavisd-new);
> dkim=pass (1024-bit key) header.d=pricom.com.au [3 [3]]
> 
> 1. When it was received by ext-mx-in002.kolabsys.com [4 [4]] from 
> pricom
> server 14.202.193.218, your signature was fine and it had passed
> 
> 2. Something happened on one of these servers (10.5.9.1 or 10.5.3.2)
> which altered the message body, after which your signature no longer
> verifies.
> 
> 3. There is no issue with your DKIM-Signature as it verifies on
> ext-mx-in002.kolabsys.com [4 [4]]
> 
> I have cut-pasted the headers from the original mail below
> 
> X-Original-To: users at lists.roundcube.net
> Delivered-To: users-at-lists-dot-roundcube-dot-net at lists.roundcube.net
> Received: from int-mx001.kolabsys.com [5 [5]] (unknown [10.5.9.1])
> by lists02.kolabsys.com [6 [6]] (Postfix) with ESMTP id EDDA7746C1
> for <users at lists.roundcube.net>; Tue,  4 May 2021 21:13:56 +0200
> (CEST)
> Received: from mx.kolabsys.com [7 [7]] (unknown [10.5.3.2])
> by int-mx001.kolabsys.com [5 [5]] (Postfix) with ESMTPS id 
> D9A1713C0376B
> for <users at lists.roundcube.net>; Tue,  4 May 2021 21:13:56 +0200
> (CEST)
> X-Orig-Spam-Flag: NO
> X-Orig-Spam-Score: 0.001
> X-Orig-Spam-Level:
> X-Orig-Spam-Status: No, score=0.001 tagged_above=-999 required=4.5
> tests=[TIME_LIMIT_EXCEEDED=0] autolearn=unavailable
> Authentication-Results: ext-mx-in002.kolabsys.com [2 [2]] 
> (amavisd-new);
> dkim=pass (1024-bit key) header.d=pricom.com.au [3 [3]]
> X-Greylist: from auto-whitelisted by SQLgrey-1.8.0
> DMARC-Filter: OpenDMARC Filter v1.3.2 ext-mx-in002.kolabsys.com [2 [2]]
> 1D8C3EAE
> Received: from pricom.com.au [3 [3]] (pricom.com.au [3 [3]] 
> [14.202.193.218])
> by ext-mx-in002.kolabsys.com [2 [2]] (Postfix) with ESMTPS id 1D8C3EAE
> for <users at lists.roundcube.net>; Tue,  4 May 2021 21:08:53 +0200
> (CEST)
> DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed;
> d=pricom.com.au [3 [3]]; s=phr1; x=1620760128; h=MIME-Version:
> Content-Type:Content-Transfer-Encoding:Date:From:To:Cc:Subject:
> Reply-To:In-Reply-To:References:User-Agent:Message-ID; bh=FmYpFg
> 8n5qzZwGVS9g1ntm5elRA=; b=oRoLjUkhqBD4I7O17UaQEiwoku0KRuVy5/Ghjb
> 2HhS4HIQMoPOK7JsinkxKUuK4Ux0XJlJAukaD7uSG61aCadR6kRXurcAtSv8kY79
> w6q2PAf/JPofvR1xVpvN4E1MGqM80s9G6fpvHCdzV0fJKRseoFpZZhkSlctcXPFh
> 95i5E=
> MIME-Version: 1.0
> 
> Links:
> ------
> [1] http://kolabsys.com
> [2] http://ext-mx-in002.kolabsys.com/
> [3] http://pricom.com.au/
> [4] http://ext-mx-in002.kolabsys.com
> [5] http://int-mx001.kolabsys.com/
> [6] http://lists02.kolabsys.com/
> [7] http://mx.kolabsys.com/


Links:
------
[1] http://kolabsys.com
[2] http://ext-mx-in002.kolabsys.com/
[3] http://pricom.com.au/
[4] http://ext-mx-in002.kolabsys.com
[5] http://int-mx001.kolabsys.com/
[6] http://lists02.kolabsys.com/
[7] http://mx.kolabsys.com/
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