Some info on the topic from Microsoft:

https://blogs.msdn.microsoft.com/tzink/2016/11/02/troubleshooting-the-red-suspicious-safety-tip-for-fraud-detection-checks/


Bryan Bradsby

Technical Lead
DIR/CTS/NOC-IT

On Tue, 2016-12-06 at 03:11 +0000, Eric Thomas wrote:

We at L-Soft have been trying to investigate the Exchange 365 red safety tip fraud detection issue, to see if there may be any software changes we could make to solve or at least circumvent the problem,

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