helo, I have install postfix system on my mail server with ubuntu 10.04, and the server works as well. for monitoring I use mailgraph to create graph on web browser. But, when I test to delete rrd file on /var/lib/mailgraph*.rrd and then make sure /var/log/mail.log empty, and next restart mailgraph. But, Why the old graph was shown ? I have delete rrd file and make sure mail.log empty. And configuration on /etc/default/mailgraph like this : what is problem? What does mailgraph not use /var/log/mail.log to update rrd file? thanks for your help.