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Phishing alert from Office 365

I have email through Office 365.
Some of my users get this alert in some emails that I have never  seen before:

"This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing <http://aka.ms/LearnAboutSpoofing>  Feedback <http://aka.ms/SafetyTipsFeedback>               "

- Where is it coming from?
- is it a new feature of Office 365?
- is it a feature we have to turn on, or is it on by default?
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2 Solutions
 
Adam BrownSr Solutions ArchitectCommented:
Most likely the sending organization(s) do not have reverse DNS configured on their mail server IP or are failing an SPF check (or they have no SPF record in DNS), in combination with having text that matches some known Phishing attempts in the body or subject. It's not really a new feature, you probably just haven't run across it til now. I can find references to similar notifications going back 3-4 years. If you know the messages are valid, you can ignore the notice. It comes from Microsoft's servers when they do spam checks.
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Michael DyerSenior Systems Support AnalystCommented:
Yes, it is part of the Microsoft Anti-Spam protection.  You can adjust the settings online if you want - check out this article for details:  

https://support.office.com/en-us/article/Office-365-email-anti-spam-protection-6a601501-a6a8-4559-b2e7-56b59c96a586
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Michael DyerSenior Systems Support AnalystCommented:
question is abandoned - awarding points to best answers
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Leif E OestliCommented:
Problem is that this link <http://aka.ms/LearnAboutSpoofing>  Feedback <http://aka.ms/SafetyTipsFeedback>     
Is not safe its antipnishing spam, so if you use Bitdefender or other serious security  programs. It will be a ongoing problem I guess. And you block down all your domain. Its a disaster and very damaging solution this one.
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