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43 votes2 comments · Office 365 Security & Compliance » Spam & Phishing · Flag idea as inappropriate… · Admin →
Refer to “Domains on the Outlook Safe Senders list aren’t recognized by Exchange Online or Exchange Online Protection” at https://support.microsoft.com/en-us/kb/3019657. All other Outlook safe sender and blocked sender lists’ iterations of safe senders, blocked senders and blocked domains are supported. For Safe Domains, the article lists solutions both for EOP Standalone and as part of Exchange Online.