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Fix Outlook 365 External Out-of-Office Replies Not Reaching Recipients
Question details
The user needs to resolve an issue where automatic out-of-office replies are successfully delivered internally and to some external addresses (like Gmail), but fail to reach specific external domains such as Yahoo and BT Internet.
- Product
- Outlook 365
- Device & OS
- not provided
- Scenario
- Setting up automatic out-of-office replies to notify external contacts when the user is away.
- Observed behavior
- Internal automatic replies and some external replies (e.g., to Gmail) are delivered successfully, but messages sent to specific domains like Yahoo and BT Internet never arrive, with no non-delivery reports (NDRs) being generated.
Ensure you have administrator privileges in Microsoft 365 to access the Exchange Admin Center, and verify that the external recipients have checked their Junk or Spam folders for the missing replies.
Run a Message Trace in Exchange Admin Center
Use the Exchange Admin Center (EAC) to track the delivery status of the automatic replies and determine if they were filtered, dropped, or successfully sent out of your tenant.
Since the automatic replies are reaching some external domains like Gmail, the feature itself is working correctly. The issue likely lies in routing or filtering between your Exchange server and the recipient's mail provider. A message trace will pinpoint where the drop-off occurs.
Log in to the Microsoft 365 admin center using your administrator credentials, navigate to 'Admin centers', and select 'Exchange'.
In the left navigation pane of the Exchange Admin Center, go to 'Mail flow' and click on 'Message trace'.
Click 'Start a trace'. Enter the sender's email address and the specific external recipient's address (e.g., the affected Yahoo or BT Internet address). Set the time range to cover when the automatic reply should have been sent.
Run the trace and review the results. Look for the 'Delivery status' column to see if the message shows as 'Delivered', 'Filtered as Spam', or 'Failed'. This will indicate whether the block is on Microsoft's end or the receiving server's end.
Investigate Spam Filtering and Non-Delivery Reports (NDRs)
Confirm whether the receiving email servers are aggressively filtering the automated replies by checking spam folders and monitoring for hidden bounce-backs.
Verify External Automatic Reply Settings
Double-check the Out of Office configuration to ensure it isn't restricted to specific external contacts.
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Frequently Asked Questions
Why do external out-of-office replies reach Gmail but not Yahoo?
Different email providers use varying security protocols and spam filters (like DMARC, SPF, and DKIM). Providers with stricter filters might silently drop automated replies if they interpret them as bulk or spam mail, whereas others like Gmail might accept them.
How often does Outlook send an out-of-office reply to the same external sender?
By default, Microsoft Exchange only sends an automatic out-of-office reply once to each unique sender during the entire period you are away. This is designed to prevent infinite email loops.
What does it mean if a message trace shows the automatic reply was 'Delivered' but the user didn't get it?
If the message trace in the Exchange Admin Center says 'Delivered', it means Microsoft successfully handed the email over to the recipient's email server (e.g., Yahoo). Any failure to appear in the recipient's inbox after that point is due to the receiving provider's internal routing, spam filtering, or inbox rules.
