Why Microsoft DLP Restricts Email Attachments and How to Fix It
Question details
Users encounter restrictions and sign-in requirements when attempting to open or share email attachments protected by Microsoft Data Loss Prevention (DLP).
- Product
- Microsoft Purview
- Device & OS
- not provided
- Scenario
- Sharing or receiving email attachments that contain potentially sensitive information such as financial data or personal identification numbers.
- Observed behavior
- Email attachments are restricted from being shared, or they require the recipient to authenticate with a Microsoft account before opening or editing the file.
Check with your IT administrator to confirm if your organization uses Microsoft Purview DLP policies and verify the sensitivity of the data you are trying to share.
Remove Sensitive Data from the Attachment
The quickest way to bypass a legitimate DLP block is to remove the restricted confidential data from the file before sharing.
Data Loss Prevention (DLP) automatically scans files for protected data like Social Security numbers or credit card details. Removing this data removes the restriction.
Locate and open the blocked document on your local drive or OneDrive.
Find and remove the confidential information (such as personal identification numbers or financial data) that triggered the DLP policy.
Click 'File' and select 'Save' to apply the changes to your sanitized document.
Attach the updated, sanitized file to a new email message and send it to your recipient.
Authenticate as the Recipient
If the file is encrypted or protected by sensitivity labels, the recipient must verify their identity to gain access.
Adjust Organization DLP Policies (Administrators)
IT administrators can modify DLP rules or add exceptions if legitimate business workflows are being blocked.
Try WPS Office for Secure and Lightweight Document Management
If you are dealing with strict Microsoft Office restrictions and need a flexible, reliable, and free alternative for creating and managing your documents locally, WPS Office offers an excellent solution. It provides a familiar interface and seamless compatibility with all major document formats without forcing complex cloud policies on your local files.
Frequently Asked Questions
What triggers Microsoft DLP to restrict an email attachment?
DLP policies are triggered when the system detects sensitive information in a file, such as credit card numbers, Social Security numbers, or specific financial data defined by your organization's IT administrators.
Can recipients without a Microsoft account open DLP-protected files?
In most cases, recipients will need to authenticate. If they do not have a Microsoft account, they may be prompted to create a free account or use a one-time passcode depending on the sender's organizational sharing settings.
How can I tell if my attachment was blocked by DLP?
You will typically receive a Policy Tip in Outlook before sending, or an email notification stating that your message was blocked or restricted because it conflicts with your organization's Data Loss Prevention policies.
