Malicious actors frequently launch phishing attacks from free email services. You can add an alert banner to emails from these domains as a reminder to users to stay vigilant, even if the email content does not look suspicious.

To turn on alert banners in emails from these domains, follow these steps:

  1. Go to Email Security > Configuration > Mail Flow. Select Frequently Exploited Domains from the tab.

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  2. Select the toggle Add an alert banner to email from frequently exploited domains to turn on alerts.

  3. Select Save.