Sergey B. created JAMES-3016:
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Summary: Remote delivery modifies message breaking DKIM signature
Key: JAMES-3016
URL: https://issues.apache.org/jira/browse/JAMES-3016
Project: James Server
Issue Type: Bug
Affects Versions: 3.3.0
Reporter: Sergey B.
Remote delivery modifies message and breaks its DKIM signature. This happens
when Content-Type is 'text/plain; charset=UTF-8' and body contains non-ascii
symbols.
Here is an example. This message was about to be sent.
{code:java}
Date: Sun, 22 Dec 2019 12:42:43 +0000 (GMT)
From: mysen...@example.com
To: myrecei...@example.org
Message-ID: <1071314998.134.1577018563940.JavaMail.root@19084506dd1d>
Subject: MySender email notification test
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
{code}
This is how it looked like at receiver side.
{code:java}
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
DKIM-Signature: a=rsa-sha256; b=DKIMSIGNATURE=; s=mail; c=relaxed/relaxed;
d=example.com; v=1; bh=BHDATA=;
h=Message-ID:Date:Subject:From:To:MIME-Version:Content-Type;
Date: Sun, 22 Dec 2019 12:42:43 +0000 (GMT)
From: mysen...@example.com
To: myrecei...@example.org
Message-ID: <1071314998.134.1577018563940.JavaMail.root@19084506dd1d>
Subject: MySender email notification test{code}
Mailet configuration is like this
{code:java}
<mailet match="All" class="org.apache.james.jdkim.mailets.ConvertTo7Bit"/>
<mailet match="All" class="org.apache.james.jdkim.mailets.DKIMSign">
<signatureTemplate>v=1; s=mail; d=example.com;
h=Message-ID:Date:Subject:From:To:MIME-Version:Content-Type; a=rsa-sha256; bh=;
b=; c=relaxed/relaxed;</signatureTemplate>
<forceCRLF>true</forceCRLF>
<privateKey><![CDATA[
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
]]></privateKey>
</mailet>
<mailet match="All" class="RemoteDelivery">
<sslEnable>false</sslEnable>
<startTLS>false</startTLS>
</mailet>{code}
Adding property mail.smtp.allow8bitmime=false to configuration of
RemoteDelivery mailet solves the problem effectively.
Disabling 8bit MIME extension, when DKIM signature is present, seems to be the
right solution.
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