Occurs if E-Mail Server is not configured. In this case, Notification is displayed.
If E-Mail Server is not configured, mail notifications cannot not be sent.
If click on the notification, Mail Server settings dialog will open. See "Mail Notifications" for details.
This notification will hide automatically as soon as all E-Mail Server parameters are configured.
Mail Notifications may not work if E-mail is not Set for Users. In this case, Error while Sending E-Mail notification will appear.
Why Event may work incorrectly
Notifications for this type of Event is hidden in system settings. See "Notifications" for more details.