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How to Stop a Shared Mailbox Auto-Reply That Will Not Turn Off
Question details
The user needs to find and disable the source of an automatic reply from a shared mailbox that continues sending despite the standard auto-reply setting being turned off.
- Product
- Microsoft Exchange / Outlook
- Device & OS
- not provided
- Scenario
- A shared mailbox is unexpectedly sending automatic replies and the standard Out of Office settings are already disabled.
- Observed behavior
- Automatic replies continue to be sent by a shared mailbox due to hidden rules, transport rules, or third-party permissions, bypassing normal settings.
Before troubleshooting, ensure you have administrative access to the Exchange Admin Center and gather a recent sample of the unwanted auto-reply email for header analysis.
Analyze Message Headers and Run an Extended Trace
Use message headers and the Exchange Admin Center to pinpoint the exact source generating the auto-reply.
Often, automatic replies are generated by unseen backend transport rules rather than the standard Outlook Out of Office feature. Running a message trace helps identify exactly where the message is originating.
Ask a recipient to forward the unwanted auto-reply as an attachment or provide the original message headers so you can investigate the source.
Review the message headers to identify the originating server, system, or rule type that is triggering the automated response.
Log into the Exchange Admin Center, navigate to Mail flow, then select Message trace. Run an extended trace for the shared mailbox to track routing and rule processing.
Check Mailbox Rules and Delegated Permissions
Auto-replies can be triggered by custom inbox rules or third-party applications with mailbox access.
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Frequently Asked Questions
Why does my shared mailbox send auto-replies even when they are turned off?
This usually happens when an alternative mechanism is sending the replies, such as a custom Outlook inbox rule created by a delegate, an Exchange transport rule, or an integrated third-party service.
How do I view the message headers of the auto-reply?
Open the received auto-reply in Outlook, go to File > Properties, and look at the 'Internet headers' box at the bottom. This data helps identify the originating server and the rules that triggered the email.
Who can run a message trace in the Exchange Admin Center?
Only users with the appropriate administrator roles, such as an Exchange Administrator or Global Administrator, can access and run message traces in the Exchange Admin Center.
