EMAIL_USER = tee@teeengtuan.com 
MAILBOX_PATH = /home/teeengtu/mail/teeengtuan.com/tee 
QUOTA_LIMIT_MB = 10240 
THRESHOLD_PERCENT = 92 
NOTIFICATION_EMAIL = hhlung2k@yahoo.com 
FROM_CRON_EMAIL = tes@teeengtuan.com 
COMMAND: du -s /home/teeengtu/mail/teeengtuan.com/tee | awk '{print $1}' 
OUTPUT:  
CURRENT_USAGE_KB:  
CURRENT_USAGE_MB: 0 
USAGE_PERCENT > 0 = 0