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Exchange Transport Rule Prepend Disclaimer not showing html formatting

Office 365 Exchange Online Transport rules: I am attempting to prepend incoming emails with warning to our users. I am able to see plain text warning but html formatting is not coming through on emails. I am using code below..

<html>
<body>
<p><div style=""background-color:#FFEB9C; width:100%; border-style: solid; border-color:#9C6500; border-width:1pt; padding:2pt; font-size:10pt; line-height:12pt; font-family:'Calibri'; color:Black; text-align: left;""><span style=""color:#9C6500; font-weight:bold;"">CAUTION:</span> 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></p>
</body>
</html>

Any ideas on how to get this to show up correctly in Outlook?

Example of formatting referred to in question

Vasil Michev (MVP)

Remove the <html> and <body> tags. The example you have attached also uses a table, so make sure you're copying the exact formatting. And keep in mind that different email system might strip the remaining tags.

</table>
<table border="1" width="200" cellspacing="0" cellpadding="10" align="center" bgcolor="yellow">
<tbody>
<tr>
<td nowrap="nowrap">[EXTERNAL]: 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.</td>
</tr>
</tbody>
</table>

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Jason Shaw

ASKER

Would Exchange Online strip away html formatting for some reason and if so, is there a change that can be made in configuration to keep formatting in place?

Vasil Michev (MVP)

The example I posted above is safe to use with Exchange Online.

Jason Shaw

ASKER

I am not as familiar with HTML as I should be. Is there a way to change font and font size?

Vasil Michev (MVP)

Yes, see the examples here: https://docs.microsoft.com/en-us/Exchange/policy-and-compliance/mail-flow-rules/signatures?view=exchserver-2019#FormatDisclaimer