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2024-07-03 15:51:14 +05:30
##How to Add External Email Warning Message Prevent Email Spoofing in Office 365
External email warning messages can be configured using mail flow rule. It prepends External to subject of email that originated from outside of the org.
***External Email Warning Message:*** 
The configured mail flow rule creates a error message that looks like the screenshot below
![External Email Warning Message](https://o365reports.com/wp-content/uploads/2020/03/prevent-name-spoofing.png?v=1705576804) 
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