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Al Douglas

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    We highly recommend using DKIM and DMARC in addition to just SPF. That said, this may be best worked via a support ticket so individual messages can be analyzed. As mentioned, it is completely possible that the issue is because of a whitelist or rule.

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    Al Douglas commented  · 

    An SPF Hard Fail will be marked as high confidence spam (SCL 9) if the advanced spam option "SPF hard fail" is enabled (https://technet.microsoft.com/en-us/library/jj200750(v=exchg.150).aspx) unless the sender is whitelisted in some way. I would suggest enabling this option, unless the email is marked with an SCL-1 then it is bypassing the content filter due to a configured allow list/ETR, and this should be identified and investigated

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