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 for WHM/cPanel and Directadmin server.

Understanding the exim Logs – WHM/cPanel
The exim configuration file;

# /etc/exim.conf

Incoming mail queue;

# /var/spool/exim/input/

Important log files;

# /var/log/exim_mainlog  :  Delivery and receipt log
# /var/log/exim_rejectlog  :  Log of messages rejected based on ACLS or other policies
# /var/log/exim_paniclog  :  Unexpected/Fatal error log

IMAP, POP login attempts, transactions, fatal errors and spam scoring;

# /var/log/maillog  And # /var/log/messages

Mailman;

# /usr/local/cpanel/3rdparty/mailmain/logs

Understanding the exim Logs – Directadmin
In direct admin control panel, the log locations are little differ from cPanel.

# /var/log/exim/mainlog
# /var/log/exim/paniclog
# /var/log/exim/processlog
# /var/log/exim/rejectlog

Thanks. 🙂

Related links:
Exim Log line flags
Exim command to find the mail that we have sent is completed or not(Unix/Linux)
Check spamming on server having EXIM
Quick way to remove all frozen emails from mail queue exim