M365 Changelog: Microsoft Secure Score recommendations- accuracy improvements

MC704191 – Due to recent accuracy improvements implemented this month, certain customers may notice a modification in specific scores.

When this will happen:

Available now

How this affects your organization:

Customers may notice a modification in the scores of the following Microsoft Defender for Identity recommendations:

• Turn on Safe Attachments in block mode
• Ensure Safe Attachments policy is enabled
• Create Safe Links policies for email messages
• Ensure Safe Links for Office Applications is Enabled
• Ensure that an anti-phishing policy has been created
• Enable impersonated domain protection
• Ensure that mailbox intelligence is enabled
• Move messages that are detected as impersonated users by mailbox intelligence
• Ensure that intelligence for impersonation protection is enabled
• Set the phishing email level threshold at 2 or higher
• Enable the domain impersonation safety tip
• Enable the user impersonation safety tip
• Quarantine messages that are detected from impersonated domains
• Quarantine messages that are detected from impersonated users
• Enable impersonated user protection
• Enable the user impersonation unusual characters safety tip
• Ensure the Common Attachment Types Filter is enabled
• Create zero-hour auto purge policies for malware
• Ensure that no sender domains are allowed for anti-spam policies
• Set action to take on bulk spam detection
• Set the email bulk complaint level (BCL) threshold to be 6 or lower
• Set action to take on high confidence phishing detection
• Set action to take on high confidence spam detection
• Set action to take on phishing detection
• Retain spam in quarantine for 30 days
• Set action to take on spam detection
• Create zero-hour auto purge policies for phishing messages
• Create zero-hour auto purge policies for spam messages
• Set automatic email forwarding rules to be system controlled
• Ensure all forms of mail forwarding are blocked and/or disabled
• Set maximum number of external recipients that a user can email per hour
• Set maximum number of internal recipients that a user can send to within an hour
• Set a daily message limit
• Ensure Exchange Online Spam Policies are set to notify administrators
• Block users who reached the message limit

What you need to do to prepare:

Be aware of these accuracy improvements and review scores as appropriate.