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https://issues.apache.org/jira/browse/TIKA-3687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500962#comment-17500962
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Thierry Guérin commented on TIKA-3687:
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Created a pull request: [https://github.com/apache/tika/pull/520.]
I went with changing the X|DKIM|ARC headers look-ahead, which was 0 to 1024.
Other solution was to increase 1024 to at least 8000 (I have another email in
which the first 'From:' is around 6400) in lines 6407-6420. I'm sure someone
here has a good idea on which version is the most efficient.
> Email file detected as text/html
> --------------------------------
>
> Key: TIKA-3687
> URL: https://issues.apache.org/jira/browse/TIKA-3687
> Project: Tika
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Thierry Guérin
> Priority: Minor
> Attachments: testRFC822-ARC.eml
>
>
> The attached email (which I redacted from a real email received from
> Office365) is detected a HTML.
> This is because it contains ARC -* headers, but they're not the first one, so
> the matcher that looks for ARC- headers fails, and the matcher for regular
> 'From' header also fails because the 'From' headers occurs after 1024
> characters.
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