Prevent Spoofing of Executives

To add a disclaimer for incoming emails that bear the name of an executive, go to the Exchange Transport Rules and create a rule.

https://admin.exchange.microsoft.com/#/transportrules

Rule Conditions:

The Message Header From Contains executive names

AND

The message is from an external sender

Then Prepend Disclaimer

'<h1 style="front-size: 150%;"><span style="text-decoration: underline; color: #ff0000;"><strong>WARNING!</strong></span><span style="color: #ff0000;"><strong> -</strong>This might be a phishing attempt.<strong>- Orange Bench</strong></span></h1>'