Скачать или смотреть How to Add External Email Warning Message |Prevent Email Spoofing|Office 365 - Exchange Admin Center

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Spoofing email from the external domains: In some other cases, attackers will register a domain for a company which they are impersonating. For example, ‘conteso. com’ instead of ‘contoso. com’. Since the mail originated from valid domain, DKIM can’t identify the spam email. As a security precaution, it’s good to alert your organization members when they receive mail from an external source.

To prevent email name spoofing, you can alert users by adopting few following methods.

Prepend “External” to subject line for incoming external emails
External sender warning/disclaimer
You can use the Exchange Transport rule to mark external emails.


Specify the disclaimer text- Will be add on comment

-Specify fallback action as ‘Wrap’


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