Recommended EOP and MDO settings

In this episode of the Blue Security Podcast, Andy and Adam discuss recommended settings for Exchange Online Protection (EOP) and Microsoft Defender for Office (MDO). They explain that EOP is the core security for M365 subscriptions, providing anti-malware, anti-spam, and anti-phishing protection. They also highlight the importance of the secure by default feature in EOP and the use of admin submissions to report false positives and false negatives. They caution against using methods like Outlook safe senders, IP allow listing, and allowed senders list within anti-spam policies, as these can bypass important security measures. They emphasize the need for organizations to regularly review and clean up their EOP policies to ensure effective email security.

Takeaways

-Exchange Online Protection (EOP) is the core security for M365 subscriptions, providing anti-malware, anti-spam, and anti-phishing protection.

-The secure by default feature in EOP ensures that high-confidence phishing and malware emails are blocked, regardless of any overrides or exceptions.

-Admin submissions should be used to report false positives and false negatives, allowing Microsoft to review and improve filtering rules.

-Methods like Outlook safe senders, IP allow listing, and allowed senders list within anti-spam policies can bypass important security measures and should be avoided.

-Regularly reviewing and cleaning up EOP policies is essential to maintain effective email security.

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YouTube Video Link:⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠https://youtu.be/guRhC1yVJYI⁠⁠⁠⁠⁠⁠⁠⁠

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Documentation:

https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/recommended-settings-for-eop-and-office365?view=o365-worldwide

https://learn.microsoft.com/en-us/defender-office-365/secure-by-default

https://learn.microsoft.com/en-us/defender-office-365/advanced-delivery-policy-configure#use-the-microsoft-defender-portal-to-configure-third-party-phishing-simulations-in-the-advanced-delivery-policy

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Andy Jaw

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Adam Brewer

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