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How to Redirect SharePoint Sharing Emails to an External Mailbox
Question details
SharePoint document-sharing notifications are being routed to Microsoft 365 Outlook rather than the designated company-hosted external mailbox.
- Product
- Microsoft 365 / SharePoint
- Device & OS
- not provided
- Scenario
- Receiving automated document-sharing notifications from SharePoint.
- Observed behavior
- Notifications bypass the external company-hosted mailbox and are delivered directly to the internal Microsoft 365 Outlook mailbox despite identical sign-in addresses.
Ensure you have Microsoft 365 Global Administrator or Exchange Administrator privileges before attempting to review or modify tenant email routing settings.
Contact Microsoft 365 Support for Tenant Configuration
Since resolving internal mail routing between SharePoint and an external mailbox requires tenant-level backend adjustments, contacting Microsoft Support is the most reliable approach.
When sign-in addresses are identical, Microsoft 365 often defaults to internal Exchange routing for service notifications. Fixing this requires modifying domain mail-flow rules or connectors.
Because these configurations can be complex and affect tenant-wide delivery, a Microsoft 365 administrator should submit a support request to have Microsoft review the configuration.
Navigate to the Microsoft 365 Admin Center (admin.microsoft.com) and log in using your administrator credentials.
Click on 'Show all' in the left-hand navigation pane, then select 'Support' followed by 'Help & support'.
Type a brief description of the issue, such as 'SharePoint sharing notifications not routing to external mailbox', and press Enter to review initial suggestions.
If the automated solutions do not resolve the routing issue, select 'Contact support' to open a ticket. A Microsoft representative will assist in reviewing your domain and email-routing configuration.
Experience Seamless Document Collaboration with WPS Office
While you troubleshoot Microsoft 365 email routing, consider WPS Office as a lightweight, free alternative. It offers robust document collaboration and sharing features without the need for complex tenant configurations.
- 1. Open Your Document: Launch WPS Office and open the document you wish to share.
- 2. Click Share: Navigate to the top right corner of the application and click the 'Share' button.
- 3. Choose Email Delivery: Select the 'Email' option to send the document or link directly through your default desktop mail client, bypassing complex internal server routing.
Frequently Asked Questions
Why do SharePoint emails go to Outlook instead of my external mailbox?
Microsoft 365 defaults to routing internal notifications, such as SharePoint sharing alerts, to the attached Exchange Online mailbox. If a custom mail flow or connector is not correctly configured, the system will not forward these internal alerts to external hosted emails.
Can I fix the SharePoint email routing myself?
Administrators can attempt to set up Exchange Online mail flow rules or connectors to forward emails from the SharePoint domain to an external host. However, resolving internal routing loops often requires Microsoft Support to verify and adjust tenant-level backend settings.
Does changing the user's alternate email address fix this issue?
Usually, no. SharePoint prioritizes the primary user principal name (UPN) and internal Exchange routing. Adding an alternate email address typically does not override the default tenant notification delivery mechanism.
