1 Default MTA The default MTA in CentOS is Sendmail, however both Postfix and Exim are supported in the Mail Transport Agent Switcher 2 Installing Exim Exim can be installed from RPM, or by using the Up2date facility. up2date exim* <enter> 3 Setting Exim as the default MTA NOTE: You will need to login as root to perform the following tasks. To make Exim the default MTA select the following: - Administration > Preferences > More Preferences > Mail Transport Agent Switcher. - Choose Exim > Click OK To make the Exim Monitor program launch at startup select the following: - Administration > Preferences > More Preferences > Sessions > Startup Programs Click Add > Type eximon > Click OK > Click Close Location of Exim Binaries /usr/sbin & /usr/bin Name of Config File exim.conf Usual Location of Config Directory /etc/exim Usual Permissions required on Exim Binaries owner:root, group:root, permissions:755 Usual Permissions required on Config Files owner:exim, group:exim, permissions:644 Usual Spool Directory /var/spool/exim Usual Queue Directory /var/spool/exim/input Usual Logfile Directory /var/log/exim 4 Starting and stopping Exim Starting Exim service exim start <enter> Stopping Exim service exim stop <enter> Restarting Exim service exim restart <enter> Default queue settings /etc/sysconfig/exim or /etc/sysconfig/sendmail |