Anti-spoof
Email spoofing is the creation of an email with a forged sender address to intentionally mislead a recipient about its origin. This technique is often used in phishing campaigns and is an attempt to get a user to click a link and share their credentials or reply with sensitive information.
Anti-spoof is automatically enabled, which means that it checks for manipulated display names and adds an alert banner if detected. Users are then protected against impersonation. You do, however, have the option to disable Anti-spoof for your organization.
To manage your Anti-spoof setting, follow the steps below.
Go to Email Security > Configuration > Mail Flow. Select Anti-spoof from the tab.
Select the toggle to enable or disable Anti-Spoof.
Select Save.