Email label policies inherit sensitivity from attachments

Overview

When users attach sensitive documents to emails, the email should inherit the highest sensitivity label from attachments to maintain consistent protection. Without this setting enabled, users might send unlabeled emails that contain sensitive attachments, creating a mismatch between the email’s sensitivity and its actual content.

Email label inheritance automatically applies the attachment’s highest priority label to the email message, ensuring protection levels match and prevent accidental data exposure.

Remediation

• Publish sensitivity labels to Configure label inheritance from email attachments.

Run it

The check runs as part of the whole assessment, with the ZeroTrustAssessment module installed:

Install-Module ZeroTrustAssessment -Scope CurrentUser
Connect-Maester
Invoke-Maester -Pack ZTA -SkipBuiltIn

Leave out -SkipBuiltIn to run Maester’s own checks in the same run.

About this check

Severity	Medium
Effort to fix	Low
Impact on users	High
Pillar	Data, AI
Category	Label Policy Configuration
Product	Purview
Feature	Information protection
Area	Data protection
Licence	RMS_S_PREMIUM, Microsoft 365 E3
Tenant	Workforce

Product, feature, area and ATT&CK are Maester’s: the assessment does not record them, so Maester keeps them in the pack’s taxonomy.json.

A Microsoft check, part of the Zero Trust Assessment pack. Text from ZeroTrustAssessment 3.1.0, © Microsoft, MIT licence.