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Proofpoint, Inc.

How to Enable Anti-Spoofing Tool for Essentials

Situation You want to quarantine inbound messages entering your organization from an external source.
Solution See below steps to modify the setting.

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.