Add tags / colors to mails without breaking sigital signature

Helmut-72 66 Reputation points


is there a way to mark e.g. external emails without breaking the sigital signature? By adding text like "Caution, external" or by color? Which also works on mobile devices (managed by Intune)? And can be managed centrally?

Thank you!

Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
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A family of Microsoft email and calendar products.
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Microsoft Intune
Microsoft Intune
A Microsoft cloud-based management solution that offers mobile device management, mobile application management, and PC management capabilities.
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  1. Jarvis Sun-MSFT 10,096 Reputation points Microsoft Vendor

    Hi @Helmut-72


    Please confirm that you are using Exchange Online, if so, you can use the External Tagging feature to test whether it will break the digital signature.

    More details about external tag you can refer to the following links:

    Native external sender callouts on email in Outlook - Microsoft Community Hub

    Add tag to external emails in Microsoft 365 for extra security

    Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

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