By default, a global quota notification is already configured and applied to all quotas. You can continue to use the global quota notification settings, modify the global notification settings, or disable or set a custom notification for a quota.
Enforcement quotas support four types of notifications and reminders:
Grace period expired
Write access denied
If a directory service is used to authenticate users, you can configure notification mappings that control how email addresses are resolved when the cluster sends a quota notification. If necessary, you can remap the domain that is used for quota email notifications and you can remap Active Directory domains, local UNIX domains, or both.