Log Locations

Common Log Locations:

Apache

Domain access logs: /usr/local/apache/domlogs/<DOMAIN>

Site and service error logs: /usr/local/apache/logs/error_log

SuExec audit log: /usr/local/apache/logs/suexec_log

SuPHP audit log: /usr/local/apache/logs/suphp_log

cPanel

Service status: /var/log/chkservd.log

Service status: /var/log/chkservd.log

Access and user actions: /usr/local/cpanel/logs/access_log

Exim

(see exim )

Fatal errors: /var/log/exim_paniclog

Incoming mail queue: /var/spool/exim/input

Exim Messages rejected based on ACLs or other policies: /var/log/exim_rejectlog

Exim Delivery and receipt: /var/log/exim_mainlog

IMAP, POP login attempts, transactions, fatal errors and spam scoring:
/var/log/maillog
/var/log/messages

System

Cron: /var/log/cron

Most other logs: /var/log/messages