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https://issues.apache.org/jira/browse/JAMES-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17518590#comment-17518590
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Benoit Tellier commented on JAMES-3742:
---------------------------------------
James uses its own super class of mime messages: MimeMessageWrapper
We could use it to override `updateHeaders` method NOT to alter the mime
version if present?
> MIME-Version header is changed, breaking DKIM signatures
> --------------------------------------------------------
>
> Key: JAMES-3742
> URL: https://issues.apache.org/jira/browse/JAMES-3742
> Project: James Server
> Issue Type: Bug
> Components: James Core
> Affects Versions: 2.3.2
> Reporter: Paul Chown
> Priority: Major
>
> We are using James to forward mails from external email servers to customer
> accounts.
> Some email clients create emails with the following headers:
> {noformat}
> Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\))
> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
> d=xxxx.gappssmtp.com; s=20210112;
>
> h=from:content-transfer-encoding:mime-version:subject:message-id:date:to;
> bh=...;
> b=...{noformat}
> So the message is signed by the originator including the {{Mime-Version}}
> header. The problem is that if we set an additional header with
> {{SetMimeHeaderHandler}} or invoke the SpamAssassin service then the method
> {{MimeMessage.updateHeaders()}} is invoked which sets a new mime version
> header:
> {noformat}
> MIME-Version: 1.0{noformat}
> thereby breaking the DKIM signature from the original sender. We can add our
> own signature using the new header, but this isn't aligned with the sender
> domain so it doesn't help. It's probably debatable whether the original Mac
> mail client mime version header is valid, but it is what it is.
> This seems to be completely broken, but the behaviour is baked into the
> {{MimeMessage}} class and we can't see any way around it. How can we preserve
> the original mime-version header and the DKIM signature?
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