If I am correct you are asking if an individual cpanel account can send notifications to a specific email address for when it is about to reach it's quota?
If so the answer is yes...It is in Contact Information & Preferences in cpanel..
You have the options..
Send notifications to your contact email address when you are reaching your disk quota.
Send notifications to your contact email address when you are reaching your bandwidth usage limit.
Send notifications to your contact email address when one of your email accounts approaches or is over quota.