Rule created in OWA is not working on Shared Mailbox that is in my mailbox

Question

Hi, I have added a Shared Mailbox to my Outlook profile and it is visible alongside my main subscription email account. I have created a rule to divert certain emails to another address. I did this in OWA to ensure that the rule was server side.

The rule is not working. How can I troubleshoot this please?

Answer 1

Hi @Andy Miller,  

Thank you for your patience so far. 

Based on my research and testing, server‑side rules in Shared Mailboxes only run when the rule is created on the Shared Mailbox itself, not from the primary mailbox where the shared mailbox is added. 

To help us narrow this down, could you please confirm how you checked that the rule appears under the Shared Mailbox’s own rules, and not under your personal mailbox? 

If the rule was created while logged in as your own mailbox (even if you selected a folder under the shared mailbox), Outlook will store the rule in your personal mailbox, meaning it will not trigger for the shared mailbox. 

To ensure the rule applies correctly, please recreate it by opening the Shared Mailbox directly in OWA: 

• Go to OWA: https://outlook.office365.com/ 
• Click your profile picture 
• Select Open another mailbox… 
• Enter the Shared Mailbox name 
• Open it 
  • Or go directly to [https://outlook.office.com/mail/your shared mailbox email]/
• After enter the Shared Mailbox directly, navigate to Settings > Mail > Rules 
• Check whether the rule is listed there 
• If it isn’t, create the rule again and test for the behavior

Following these exact steps, I was able to successfully forward emails from a shared mailbox to another mailbox during testing. 

If the rule still doesn't work, please check whether the target email address is internal.  Forwarding to external addresses may be blocked by your organization’s policies. In that case, your IT admin may need to adjust Conditional Access or the organization’s outbound/anti‑spam settings to allow external auto‑forwarding. 

Please let me know what you find, and I’ll be happy to continue assisting. 

Answer 2

Hello @Andy Miller,  

Good day! Thank you for posting your valuable question on Microsoft Q&A forum.   

From what you’ve described, it sounds like you created a server-side rule in OWA for a shared mailbox added to your Outlook profile, but the rule isn’t firing when new messages arrive. You also mentioned that the rule is definitely listed under the shared mailbox, not your personal mailbox. 

If I’ve misunderstood anything, please feel free to correct me. 

To help narrow things down, could you share a bit more detail about your setup? The following points would be especially helpful: 

• What are the exact actions in the rule and What exactly does the rule do? 
• Does the rule forward or redirect messages, especially to an external address? Exchange can block automatic forwarding depending on forwarding settings, remote domain configuration, or outbound spam policies.  
• How was the shared mailbox added in Outlook? If it’s auto‑mapped, that can sometimes cause rules not to run properly. Adding it as a separate account is more reliable.  
• Are there other users with access to this shared mailbox? If someone else has a client-side rule in their Outlook profile, it can override or interfere with your rule.  
• Do you have Full Access permission on this mailbox?
• If comfortable, can you share a screenshot describe your rule (with your personal information removed)? 

This additional context will help us understand your environment and the steps already taken so we can tailor the guidance to resolve the issue effectively.  

While we wait for your details, here are a few quick checks you can try on your end: 

• Try creating a very simple rule in OWA (e.g., “move messages with subject ‘test123’ to Folder X”) and see if that one runs. This helps rule out complexity/size issues.  
• If the rule forwards externally, try forwarding internally instead to confirm whether the tenant is blocking external forwarding.  
• Ask any other users who have access to the shared mailbox to temporarily disable their Outlook desktop rules. Conflicts can stop shared-mailbox rules from triggering.  
• If you're using Outlook desktop, try adding the shared mailbox as a full account instead of relying on auto‑mapping. This often improves rule reliability.  

I apologize if I could not jump straight to a solution. I want to avoid suggesting anything that might be inaccurate or unhelpful. Once we have the details above, we’ll be able to assist you more effectively and guide you toward the right resolution.  

Looking forward to your reply so we can sort this out together. 

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