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Michael Henriksson's avatar
Michael Henriksson
Copper Contributor
May 03, 2018

SPF = Fail but still delivered to inbox

Hi

A few weeks ago i wrote this post:

https://techcommunity.microsoft.com/t5/Office-365/Email-from-domains-with-no-SPF-goin-to-junk/m-p/172174#M11705

 

But this seems to have changed.

Now we have problem with SPF=Fail going to users inbox.

 

There has been a increasing amount of spoofing attempts and we are trying hard to keep our users secure, why is Failed SPF still going to users inbox?

 

SPF Hard fail is active and we are using Office 365 with APT for all our users.

 

Best Regards

Michael   

exchange
office 365

1 Reply

  • VasilMichev's avatar
    VasilMichev
    MVP
    May 03, 2018

    Best thing to do is report the message via the Junk add-in and open a support case to have it properly investigated. We can certainly give some hints based on the header information and such, but it might as well be something at the backend (like the changes which caused the previous "incident").

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