The exim is an open source email server and it has a lot of flexible options and commands to manage. Here is some useful configuration and log files of the exim mail server:
Default exim service demon is: /usr/sbin/exim
Default exim configuration file is: /etc/exim.conf
Exim has a configuration file & it should be created if it doesn't exists as: /etc/exim.conf.local
Exim runs its processes in Linux system by username: mailnull
Exim Log path is: /var/log/exim_mainlog
Exim Panic log: /var/log/exim_paniclog
Exim Reject log: /var/log/exim_rejectlog
Exim PID file is: /var/spool/exim/exim-daemon.pid that holds process ID detail.
Exim does all the active logs to: /var/log/exim_mainlog
Exim does all the reject logs to: /var/log/exim_paniclog
Exim does log the data to: /var/log/exim_paniclog
If exim dies, findout why at: /var/log/messages - generated by system log.
