For MySQL Enterprise Monitor an agent is required. I've downloaded V23981-01.zip from https://edelivery.oracle.com which contains mysqlmonitoragent-2.3.1.2044-linux-glibc2.3-x86-64bit-installer.rpm When I was testing the email alerting for my backup script I got an error: /etc/mail/submit.cf: line 544: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory Luckily RPM was able to tell me that mysqlmonitoragent had set / to the wrong permissions.     # rpm -qf / filesystem-2.4.0-3.el5 mysqlmonitoragent-2.3.1.2044-0 # rpm -qvl mysqlmonitoragent-2.3.1.2044-0 | head -1 drwxrwxr-x 2 root root 0 Nov 25 01:51 / # rpm -qvl filesystem-2.4.0-3.el5 | head -1 drwxr-xr-x 2 root root 0 Oct 1 2009 / # echo test | mail -s test user@example.com # /etc/mail/submit.cf: line 544: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory I've filed Bug #60752 for this. So watch out for this bug...