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To add Guardian Mail In the Symantec Email Gateway appliance, in the Control Center, go to Reputation -> Bad Senders, ensure that ‘Enable Third-Party Bad Sender detection’ is enabled, click ‘Add’, and enter: 
<APIKEY>.combined.mail.abusix.zone.
Replace <APIKEY> with “Your API key” from your account in app.abusix.com. Please make sure the Action is set to ‘Reject SMTP Connection’ and then click ‘Save.’