Create External Email Warning
External email warnings are custom messages that you can add to the top of the email. It’s still a good idea to warn your users of malicious emails, even though we can now tag external emails in Exchange Online. The custom warning allows us to warn users based on the content or subject of the email.
So we are not going to warn users for every single external email with this, only if the content or subject contains specific words or phrases. To create the external email warning we are going to use Exchange Transport Rules. You can use this method both in Exchange Online and Exchange On-Premise.
We are first going to use the Office 365 Exchange Online Admin Center to configure the external email warning. At the end of the article I also have a PowerShell script that you can use.
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