Adding External Warning Message to Microsoft 365 Exchange Online Messages

~ 0 min
2021-08-26 11:14

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 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/>
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