How to Stop Exchange Online Sending from Aliases Setting Re-Enabling
Question details
The user needs to prevent the 'Turn on sending from aliases' setting in Exchange Online from automatically turning back on after being disabled by an admin.
- Product
- Microsoft Exchange Online
- Device & OS
- not provided
- Scenario
- Administrators disabling the 'Turn on sending from aliases' feature to control shared mailbox behavior in Outlook.
- Observed behavior
- The setting automatically becomes enabled again several hours after an administrator explicitly disables it.
Ensure you have Microsoft 365 Global Administrator or Exchange Administrator privileges, as these are required to investigate tenant-level settings or open service requests.
Open a Service Request in the Microsoft 365 Admin Center
Since this reversion is likely caused by a backend Microsoft service or an automated administrative process, Microsoft Support must investigate your tenant directly.
Community forum staff and standard troubleshooting steps cannot resolve automated backend reversions. A designated Microsoft 365 administrator must authorize Microsoft to inspect the tenant's backend logs to identify what service is overwriting the setting.
Navigate to the Microsoft 365 Admin Center and sign in using your administrator credentials.
On the left-hand navigation menu, scroll down and click on 'Support', then select 'Help & support' or 'Service requests'.
Describe your issue, stating that the 'Turn on sending from aliases' setting reverts to enabled a few hours after being disabled. Follow the prompts to submit the ticket for a backend investigation.
Check the Administrator Audit Logs
Review your Exchange organization's audit logs to rule out other administrators or automated PowerShell scripts making unauthorized changes.
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Frequently Asked Questions
Why does the 'Turn on sending from aliases' setting affect shared mailboxes in Outlook?
When this setting is enabled, it allows users to send emails using proxy addresses (aliases) associated with a mailbox. For shared mailboxes, this can sometimes cause unexpected sender address routing or confusion if users accidentally select the wrong alias from the From drop-down menu in Outlook.
Can I permanently disable this setting using Exchange Online PowerShell?
Administrators can run 'Set-OrganizationConfig -SendFromAliasEnabled $false' in Exchange Online PowerShell. However, if a backend Microsoft sync service or a tenant-level automated policy is causing the reversion, the PowerShell change will eventually be overwritten again just like the GUI change.
Who can submit a service request for Microsoft 365 backend issues?
Only users assigned appropriate administrative roles, such as Global Administrator or Service Support Administrator, have the permissions required to access the Support section in the Microsoft 365 Admin Center and submit a tenant-level service request.
