Microsoft Defender for Office 365: Handling Malicious Intra-Organizational Messages

In an effort to enhance security and reduce cyber threats, Microsoft will be updating the way intra-organizational messages containing malicious URLs are handled in Microsoft Defender for Office 365. This update, which is expected to be complete by mid-June, will give administrators at least 30 days to choose whether or not to opt out of the new anti-spam policy.

Administrators will also be able to define how they want to handle malicious or spam-based URLs detected in intra-organizational messages. Initially, the default behavior will be to take no action but record the detection. After the opt-out period, the default behavior will be to quarantine messages containing high confidence phishing URLs.

No action is required for users as this update will be implemented by Microsoft.

More information about this update can be found in the Configure spam filter policies section of Microsoft's website.

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