HOWTO: DKIM Signing with Kolab 16 on Debian 9

[Koch, Peter]

Hi Jan,

I just did a test with a fresh installation of thunderbird 68.0 on 
windows 10.
Everything is left as suggested and default (except making it my default 
mailprog).

"mydomain" is the sending Kolab 16 server on Debian 9, and "otherdomain" 
  is the receiver, a Virtualmin 6.07 server on CentOS 7.6:

-------------------------------------------------------
Return-Path: 	<peter.koch at mydomain.com>
X-Spam-Checker-Version: 	SpamAssassin 3.4.0 (2014-02-07) on 
otherhost.otherdomain.com
X-Spam-Level:
X-Spam-Status: 	No, score=-100.1 required=4.0 
tests=DKIM_SIGNED,DKIM_VALID, 
DKIM_VALID_AU,SPF_HELO_NONE,SPF_PASS,USER_IN_WHITELIST autolearn=ham 
autolearn_force=no version=3.4.0
X-Original-To: 	peter at otherdomain.com
Delivered-To: 	peter.koch-otherdomain.com at otherhost.otherdomain.com
Received: 	from myhost.mydomain.com (myhost.mydomain.com 
[100.100.100.100]) by otherhost.otherdomain.com (Postfix) with ESMTPS id 
67C6C3EA66 for <peter at otherdomain.com>; Mon, 9 Sep 2019 12:09:15 +0200 
(CEST)
DKIM-Filter: 	OpenDKIM Filter v2.11.0 otherhost.otherdomain.com 
67C6C3EA66
Authentication-Results: 	otherhost.otherdomain.com; dkim=pass (4096-bit 
key) header.d=mydomain.com header.i=@mydomain.com header.b="PUe+xC4T"
To: 	peter at otherdomain.com
DKIM-Signature: 	v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.com; 
s=myhost; t=1568023754; bh=xeSrmjz/5X...ZI=; 
h=To:From:Subject:Date:From; b=PUe+xC4TCO+.....
 From: 	Peter Koch <peter.koch at mydomain.com>
Subject: 	DKIM Test Thunderbird 68.0
Message-ID: 	<2446adbe-9e7e-8335-1759-7f539a9e9c21 at mydomain.com>
Date: 	Mon, 9 Sep 2019 12:09:14 +0200
MIME-Version: 	1.0
Content-Type: 	text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 	7bit
-------------------------------------------------------

The result looks good for me, DKIM_VALID, dkim=pass:

Let me know if I shall check or change any settings of thunderbird for 
more tests.

Kind regards
Peter

Am 09.09.2019 11:53, schrieb Jan Kowalsky:
> Hi Peter,
> 
> Am 08.09.19 um 19:48 schrieb Koch, Peter:
>> After fighting quite a bit to get DKIM signing to work, I finally
>> succeeded.
>> The existing documentation did not help much so I decided to write a
>> howto for Kolab 16 on Debian 9:
>> 
>> https://diala.org/dokuwiki/howto/dkim_signing_with_kolab_16_on_debian_9
> 
> great, thanks a lot.
> 
> By the way: did you encounter the problem that wallace parses messages
> after they are already signed by dkim?
> 
> We got the problem that in the mail flow it's working like this:
> 
>  Postfix SMTPD
>        |
>        V
>      Milter (dkim signature)
>        |
>        V
>     Wallace
> 
> While wallaces seems to enforce mails with non ascii characters to
> quoted printable encoding (even if the mail clients submits it with
> 8bit) the message is rewritten by wallace with the result that dkim
> signature is broken:
> 
>   https://lists.kolab.org/pipermail/users/2018-May/021441.html
> and ff.:
>   https://lists.kolab.org/pipermail/users/2018-June/021442.html
> 
> I would appreciate if you could test your dkim signing against emails
> from an email client which doesn't encode mails in quoted printable -
> and instead does 8 bit utf8 if any special characters are used.
> 
> Thunderbird e.g. does this with default (mail.strictly_mime set to 
> false).
> 
> Kind regards
> Jan
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