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Microsoft recently launched a new feature in Exchange Online to help increase the user’s awareness by automatically tagging external emails. Features like SPF, DKIM, and DMARC already do a great job in preventing most phishing emails, but we all know that it’s still not enough.Įspecially spoofed emails, which seem to have been sent from a trusted source in your organization, are a great security risk. Enable External Email TagĮxternal email tagging is an extra security layer to help protect you against phishing emails.
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In this article, I will explain how you can enable the Exchange Online External Tag and create custom external email warnings in Office 365 and Outlook. It allows us to show a warning for phrases like, “keep your password”, or “update your password” We can show the custom warning based on words in the subject or body, making it really versatile. The second option is to add a custom warning banner at the top of the email. This will enable a built-in warning between the subject and body of the email when the email is sent from outside your organization.
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The first one is enabling the external email tag in Exchange Online. There are basically two options, which you should both implement. We can prevent that by adding an external email warning or tag external emails. Typically users find them also hard to recognize and click too often on the links in the emails. The phishing emails are getting better every year making it hard to block them up front. Phishing emails are one the biggest security threads at the moment.