When a device notifies NetCloud Manager of an alert, NetCloud Manager sends an email notification to the email address(s) configured in the corresponding Alert Rule. NetCloud Manager does not have control over the delivery of the alert email notification once it is dispatched to its destination address. Some email servers might reject, or experience long delays, in the delivery of alert email notifications.
To troubleshoot suspected issues with email servers, configure a different email address on a different domain and test the delivery behavior of the alert emails.