Change system generated Out of Office Prefix in Exchange Online


Hi all,

My customer wants to change the system generated prefix for out of office messages in Exchange Online. Is there a possibility to replace the OOF prefix "Automatic reply:[Subject]" with a custom message? For example "Automatic Out of Office Replay:[Subject]".

Kind Regards


Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Andy David - MVP 142.7K Reputation points MVP

    Not possible with the standard Out Of Office reply feature.

    You can create custom auto-replies with Outlook and not use the Out Of Office wizard, but you have to leave Outlook running:

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  1. Victor Ivanidze 101 Reputation points

    I believe you can create a Power Automate flow that will rewrite the prefix.

    Alternatively you can use a third-party cloud service to modify an OOF message.

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