Data Protection Issues

Fix External Guest Email Addresses Exposed in SharePoint Sharing

Maira Mehtab Oct 13, 2026 868 views

Question details

SharePoint sharing messages are exposing external guest email addresses by placing them in the CC field rather than sending individual notifications.

How to Fix External Guest Email Addresses Exposed in SharePoint Sharing Messages

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Sharing a SharePoint folder or document with multiple external recipients simultaneously.
Observed behavior: SharePoint inconsistently sends a single bulk email with all external recipients listed in the CC field, exposing their names and private email addresses to the entire group.

Before you start

Immediately stop sharing confidential content or folders with large groups of external recipients until this privacy issue is investigated by your IT department.

Solution 1Recommended

Report the Issue to Microsoft 365 Support

Because this is an inconsistent system behavior with no user-facing setting to fix it, an administrator must escalate the issue to Microsoft Support.

Currently, there is no built-in SharePoint toggle to force separate sharing emails for external guests. The bulk CC behavior can occur sporadically, posing a data protection risk.

Document the sharing details

Note the exact date, the SharePoint site URL, the specific folder shared, the list of external recipients, and the exact sharing method used.

Access the Microsoft 365 admin center

Have a global administrator log in to the Microsoft 365 admin center using their administrator credentials.

Open a support request

Navigate to the Support section, select 'New service request', and submit a ticket detailing the email exposure and data protection issue.

Report the Issue to Microsoft 365 Support

Administrator Required: Standard users cannot open support tickets directly with Microsoft. An authorized Microsoft 365 administrator is required to submit the service request.

Solution 2

Use Individual Sharing Links (Workaround)

Prevent email exposure by generating a specific sharing link and distributing it manually via BCC.

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Frequently Asked Questions

Why does SharePoint put external guests in the CC field?

This is an inconsistent system behavior in SharePoint when sharing folders with multiple external users at once. Currently, there is no direct user setting to toggle between individual emails and bulk CC messages.

Can I disable email notifications entirely when sharing in SharePoint?

Yes, when sharing a file or folder, you can uncheck the 'Send an email notification' option and manually distribute the generated sharing link through your own secure email channels.

Is there a limit to how many external users I can share a SharePoint folder with?

While SharePoint allows sharing with many users, sharing with large external groups simultaneously (e.g., over 20-25 recipients) can sometimes trigger this bulk email exposure behavior. It is safer to use security groups or individual links.

How can I safely share confidential files with multiple people?

To ensure maximum data privacy and prevent address exposure, generate a secure sharing link in SharePoint and manually email it using the BCC (Blind Carbon Copy) field in your email client.

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