Adding External Warning Message to Microsoft 365 Exchange Online Messages

~ 0 min
2022-11-09 23:57

If you'd like to prepend an external disclaimer to messages from outside the 365 organization, you can do so using the instructions below. You can also add "[EXTERNAL]: " in the subject by adding an addition action.

End result:

Logon to 365 Admin Portal
Exchange Admin Center
Mail Flow
Create New Rule
Select "More options..." at bottom

Use the following parameters below. The HTML code is at the bottom.


HTML Code samples for disclaimer:

<div id="external-disclaimer" style="background-color: #ffeb9c; width: 100%; border: 1px solid #FFEB9C; padding: 2pt; border-style: solid; border-color: #9C6500;">CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.</div><br/>
Tags: security
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