> Hello Ankush, > > Check /var/log/cron to see what cron job is running. Jobs like sa > (systat) generally run every 10 minutes as root. So these might be usual. I have created few scripts also but they run once daily.I will check the cron log also. > For the sendmail logs, nothing much to worry as a relaying attempt was > denied. If this is a public facing server running sendmail, these > entries might be pretty common atleast in India. > But if you are really worried, cheking the actual logs might give more > insights to the problem I am using Postfix and this machine is acting as Mail server for my domain.I have Pix Firewall controlling my domain., so I am not much worried about it.My main concern is cron logs. The Postfix is also running as root means all the files in postfix folder(/etc/postfix) are owned by root ,if i change the ownership of those files to postfix(user as well as group) will it affect the performance or working of Postfix. Thanks & Regards Ankush Grover