Go to "Alerts" > "Email and SMTP" in the settings (gear mark) on the upper right of the Unisphere management screen.
Under "Send email alerts to the following email list:", click + (Add) to add the email addresses to send to.
For registrations of 21 or more, the following error code is output.
Alert Email Configuration The number of email addresses configured has exceeded the limit 20.(Error Code:0x6000b6f)
The maximum number of email addresses that can be registered for alert email notification is 20.
Up to 20 email addresses can be registered for alert email notifications.