Out of office doesn't work for external users.

Question

Out of office doesn't work for external users in On-Premises Exchange 2016. I have set RemoteDomain $true. Configured auto reply for a user from exchange managment shell, OWA and outlook. verified the configuration but no luck in auto reply for external domains users. It's only working for internal users.

Answer

Hi,

Welcome to the Microsoft forum.

You can try to do the following:

Run the command: Set-RemoteDomain -AllowedOOFType 'External' -Identity 'Default'. The AllowedOOFType parameter specifies the type of automatic replies or out-of-office (also known as OOF) notifications than can be sent to recipients in the remote domain. About the parameter's detail you could refer to:https://video2.skills-academy.com/en-us/powershell/module/exchange/set-remotedomain?view=exchange-ps
If the first suggestion doesn't work, you can try to set AllowedOOFType to "ExternalLegacy"
If it still doesn't work,try to run the command: **Set-RemoteDomain "contoso.mail.onmicrosoft.com" -TNEFEnabled $true -AllowedOOFType "InternalLegacy"**This applies to the situation: Exchange Online users cannot view the out-of-office replies of local users. You can refer to: Out-of-office replies and voting options show wrongly - Exchange | Microsoft Learn
Check if remote domain blocks OOF replies. This setting can be found in Exchange Admin Center > Mail flow > Remote domains.>Edit reply types More details you can refer to:https://video2.skills-academy.com/en-us/exchange/troubleshoot/email-delivery/understand-troubleshoot-oof-replies

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Out of office doesn't work for external users.

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