Out of Office Reply - External user

Question

We have a issue for a single user - after we set the Out of Office message for internally and external emails.

External users are not receiving the reply that the user is out of the office.

Out of Office reply for outside users is turned ON. I have confirmed via PowerShell and tested using my own account
Out of Office for internal users is working fine.

This specific user do not have any rule that overrules the OOO

Any ideas?

Answer 1

@Joao Diogo

Do you mean that your mailbox could send OOF to external mailbox successfully? Does the external account you used belong to the same domain(such as, gmail or hotmail) as the single user?

If your mailbox cannot send OOF to external mailbox successfully, I would suggest you have a check settings with remote domain:

If your mailbox could send OOF to that external domain, I would suggest you use command below to check whether OOF generate for that single user:

Get-MessageTrace -SenderAddress singleUser@domain.onmicrosoft.com -StartDate 3/21/2021 -EndDate 3/23/2021  

If this OOF generated and delivered, this OOF message may be blocked on the recipient side.

If OOF email doesn't generate, it means there may exist issue with the OOF configuration on this single user, I would suggest you try to check from OWA for this mailbox:

If all settings configured correctly, I would suggest you open a service request to Office 365 to let them help you check from the back-end.

---

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.