How to disable the "External sender" banner in Outlook

Jean Paul Nkundabose 100 Reputation points

I recently started seeing a banner in Outlook that says "External sender - This email was from outside your organization. Reply only if you know this sender and trust the content." How can I disable it, and where does it come from?User's image

Microsoft Exchange Online
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. Shaofan Lv-MSFT 6,915 Reputation points Microsoft Vendor

    Hello @Jean Paul Nkundabose

    Please check to see if it has been updated recently. I found a recent case similar to yours. The moderator mentioned that it was caused by an update, and the problem resolved itself within 24 hours. Please refer to this if you want to roll back to an older version.

    In addition, not sure if it could be related to this.User's image



    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

    1 person found this answer helpful.

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  1. Andy David - MVP 145.1K Reputation points MVP

    That looks like some custom banner setup by your org with a transport rule disclaimer or 3rd party product.

    The "official" external banner looks like this: