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Quarantined Messages / Authentication failure / DMARC

Hello Sophos Email friends,

I'm struggling with the quarantine because there are lots of emails quarantined by "Authentication failure / DMARC".

As an example I have an email that is OK and that looks pretty good, but it's quarantined by DMARC.

The sending server is OK: 

SPF is OK:

DMARC is set, but no policy is activated, so it should be OK: 

The mail header shows

Authentication-Results:; spf=none; dkim=none; dmarc=fail (recordpolicy=none)

How can I get more informations why the mail was quarantined by DMARC policy?

Best regards


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