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DKIM Fail - Only to Outlook/Hotmail RRS feed

  • Question

  • Hi,

    Apologies if this is in the wrong category.

    We have SPF, DKIM & DMARC all setup and authenticating. However, our DKIM seems to fail to all Microsoft domains. Strangely, it occasionally passes but predominantly fails.

    Example message header below:

    Authentication-Results: spf=pass (sender IP is 168.xx.xx.48)

    smtp.mailfrom=em7451.domain.com; hotmail.com; dkim=fail (signature did not

    verify) header.d=domain.com;hotmail.com; dmarc=pass action=none

    header.from=domain.com;compauth=pass reason=100

    Our DKIM verifies/passes with all other email providers - Gmail, Yahoo, etc. and within all of our testing tools – Glock Apps, Mail-tester, SendForensics.

    Could anybody shed light on why this is happening to only @hotmail and @outlook domains?

    Thanks

    Saturday, February 29, 2020 7:45 PM

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