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Terry Zink (Senior PM in Office 365)

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  1. 120 votes
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    Terry Zink (Senior PM in Office 365) commented  · 

    Don't have anything to say on the External safety tip, but for unauthenticated email this is available for Advanced Threat Protection customers, see http://aka.ms/LearnAboutSpoofing for how we treat unauth'ed messages.

  2. 112 votes
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    Terry Zink (Senior PM in Office 365) commented  · 

    You shouldn't need to turn off SPF and DMARC (it isn't necessary to disable DKIM checks). As long as the MX doesn't point to Office 365 (e.g., it points to MimeCast), SPF checks are supposed to be disabled already (the additional spam rule option doesn't consider this, but you shouldn't turn it on).

    A little more detail - the SPF/DMARC checks will still appear in the Authentication-Results header, but they won't be enforced anywhere in the filter.

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