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https://issues.apache.org/jira/browse/JAMES-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17104130#comment-17104130
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Benoit Tellier commented on JAMES-3178:
---------------------------------------
https://github.com/linagora/james-project/pull/3368 proposes a fix for this
> AutomaticSentMail detector should bypass javax.mail parsing
> -----------------------------------------------------------
>
> Key: JAMES-3178
> URL: https://issues.apache.org/jira/browse/JAMES-3178
> Project: James Server
> Issue Type: Improvement
> Components: Mailet Contributions
> Reporter: Benoit Tellier
> Priority: Major
> Labels: bug
>
> We rely on `mime4j` for mail content parsing, we should bypass the implicit
> parsing and sanitizing performed in `MimeMessage::getInputStream`.
> As the JavaX.mail javadoc says:
> {code:java}
> Return a decoded input stream for this Message's "content".
> {code}
> To do so, we can use MimeMessageInputStream in james-server-core, wich also
> implies relocating `AutomaticallySentMailDetectorImpl`.
> Note that javax parsing is less robust than mime4j one, leading to the
> following exception:
> {code:java}
> javax.mail.MessagingException: Can not read content
> at
> org.apache.mailet.base.AutomaticallySentMailDetectorImpl.isMdnSentAutomatically(AutomaticallySentMailDetectorImpl.java:107)
> at
> org.apache.mailet.base.AutomaticallySentMailDetectorImpl.isAutomaticallySent(AutomaticallySentMailDetectorImpl.java:54)
> at
> org.apache.james.jmap.mailet.VacationMailet.service(VacationMailet.java:72)
> at
> org.apache.james.mailetcontainer.impl.camel.CamelProcessor.process(CamelProcessor.java:77)
> [...]
> Caused by: java.io.IOException: Unknown encoding: 8bitMIME-version
> at
> javax.mail.internet.MimePartDataSource.getInputStream(MimePartDataSource.java:116)
> at javax.activation.DataHandler.getInputStream(DataHandler.java:238)
> at javax.mail.internet.MimeMessage.getInputStream(MimeMessage.java:1395)
> at
> org.apache.james.server.core.MimeMessageCopyOnWriteProxy.getInputStream(MimeMessageCopyOnWriteProxy.java:265)
> at
> org.apache.mailet.base.AutomaticallySentMailDetectorImpl.isMdnSentAutomatically(AutomaticallySentMailDetectorImpl.java:103)
> ... 92 common frames omitted
> Caused by: javax.mail.MessagingException: Unknown encoding: 8bitMIME-version
> at javax.mail.internet.MimeUtility.decode(MimeUtility.java:405)
> at
> javax.mail.internet.MimePartDataSource.getInputStream(MimePartDataSource.java:109)
> {code}
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