Knowledgebase
Anti-Spoofing Tool for Essentials

This rule is designed to quarantine external inbound message that appear to come from your organization. This tool will only work if you deliver your internal e-mail from your domain locally. If you receive e-mail from an external source using your domain name your messages will get quarantined.

You can find this setting in Company Settings -> Spam

Add a check to: Inbound domain spoofing protection:

Messages in the quarantine should appear with a new category: Domain Spoofing

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