603 votes31 comments · Office 365 Security & Compliance » Spam & Phishing · Flag idea as inappropriate… · Admin →
ATP does not consider mails from other Office 365 tenants, or even mailboxes inside of your tenant, as safe. The best way to put a stop to this is to follow the recommendations in SecureScore for your tenant; and report phishing mails to us promptly. Also, make sure that the sender is not allowed either by the tenant configuration or the user safelist.
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Signifigant increase in all of my customers running O365 over past 3 weeks - as other posters have said, really hard explaining why our move to "upgraded solution of Office 365" is having many more spam email issues than old solution, and the natives are getting restless - MS needs to reslove ASAP