Hello,
Please check sachin sawant post in below thread.
https://www-secure.symantec.com/connect/forums/notification-5
Hi please check following link,
https://www-secure.symantec.com/connect/forums/low-disk-space-alert
I believe there is already an automation policy for this, just have to go turn it on.
Thank team for your support...Cheeers!!!!!!!!!!!!!!!!!!