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https://issues.apache.org/jira/browse/JAMES-3016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008234#comment-17008234
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Benoit Tellier commented on JAMES-3016:
---------------------------------------
Thanks for the usefull feedback.
We need to evaluate the impact of disabling this option by default, or at the
very least document this behaviour.
Regards,
Benoit
> 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.
> Priority: Major
>
> 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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