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https://issues.apache.org/jira/browse/TIKA-879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257888#comment-14257888
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Nick Burch commented on TIKA-879:
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I've done something a little different in r1647721 as a partial workaround -
I've added a new mimetype of text/x-tika-text-based-message which is a parent
of the 3 text-based message/ mimetypes (most of the message/ mimetypes are not
text based). With that in place, Vladimir's test email is now correctly
detected when it has a .eml extension. (I think that this parent probably is
more semantically meaningful than text/plain, which is why I went for it)
However, this doesn't solve the "detection without filename" issue, and some
other related mail detection problems (eg multipart/signed). We might therefore
want to think about adding a new mail detector, along the lines of the one
suggested in this Stack Overflow question from a few weeks back -
http://stackoverflow.com/questions/27397807/tika-detect-multipart-signed
> Detection problem: message/rfc822 file is detected as text/plain.
> -----------------------------------------------------------------
>
> Key: TIKA-879
> URL: https://issues.apache.org/jira/browse/TIKA-879
> Project: Tika
> Issue Type: Bug
> Components: metadata, mime
> Affects Versions: 1.0, 1.1, 1.2
> Environment: linux 3.2.9
> oracle jdk7, openjdk7, sun jdk6
> Reporter: Konstantin Gribov
> Assignee: Nick Burch
> Attachments: TIKA-879-thunderbird.eml
>
>
> When using {{DefaultDetector}} mime type for {{.eml}} files is different (you
> can test it on {{testRFC822}} and {{testRFC822_base64}} in
> {{tika-parsers/src/test/resources/test-documents/}}).
> Main reason for such behavior is that only magic detector is really works for
> such files. Even if you set {{CONTENT_TYPE}} in metadata or some {{.eml}}
> file name in {{RESOURCE_NAME_KEY}}.
> As I found {{MediaTypeRegistry.isSpecializationOf("message/rfc822",
> "text/plain")}} returns {{false}}, so detection by {{MimeTypes.detect(...)}}
> works only by magic.
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