[jira] [Commented] (JAMES-3016) Remote delivery modifies message breaking DKIM signature

["Benoit Tellier (Jira)" <se...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/JAMES-3016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17139056#comment-17139056 ] 

Benoit Tellier commented on JAMES-3016:
---------------------------------------

[~rcordier] why did you reopened this?

> 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
>             Fix For: 3.5.0
>
>
> 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: mysender@example.com
> To: myreceiver@example.org
> Message-ID: <10...@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: mysender@example.com
> To: myreceiver@example.org
> Message-ID: <10...@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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