External Banner

How do I setup an "External" banner for emails originating from outside our organization?

Thanks!

1 Reply

Follow the steps here: https://office365itpros.com/2019/03/08/marking-external-email-with-exchange-transport-rule/
Or here for the recently announced "tagging" feature: https://office365itpros.com/2021/03/11/exchange-online-external-email-tagging/