Reference:
http://www.nutanixpedia.com/p/configuring-ha.html

https://portal.nutanix.com/page/documents/details/?targetId=Prism_Central_Guide-Acr_v4_6:mul_alerts_management_pc_c.html Prism Central allows you to configure the alert messages sent by Prism Central. To configure alert settings, reporting rules, and message templates, do the following:
Note: Alert emails sent by Prism Central are in addition to any alert emails you might have configured on individual clusters through the Prism web console. You will receive email from both entities in this case. Prism Central alert emailing is not enabled by default; you must explicitly enable it and specify the recipients (Nutanix customer support and/or supplied email addresses).
* Do one of the following:
* In the gear icon pull-down list of the main menu, select Alert Email Configuration.
* In the Alerts dashboard, click the Email Configuration button.
The Alert Email Configuration window appears.
* Click the Settings tab and do the following:
* Enable Prism Central to sent alert emails.
* Check the Email Every Alert box to send an email whenever the event occurs.
* Check the Email Daily Digest box to send a cumulative (24 hour) list of alerts once a day.
You can check one or both boxes. If neither box is checked, no alert emails are sent by Prism Central.
* Check the Nutanix Support box to send alert notification to Nutanix customer support.
* To send alert notifications to others, enter their email addresses in a comma separate list in the field below the Nutanix Support box.
* Click the Apply button to apply the changes and continue the configuration (or click the Save button to apply the changes and close the window).
The Connection Status section displays mail transport status information. In this example, an SMTP server is configured for mail service. Clicking the Details link opens the SMTP server settings window