How to check cPanel email log
Logs Location
Delivery and receipt log /var/log/exim_mainlog
Incoming mail queue /var/spool/exim/input/
Log of messages rejected based on ACLS or other policies /var/log/exim_rejectlog
Unexpected/Fatal error log /var/log/exim_paniclog
IMAP, POP login attempts, transactions, fatal errors & spam scoring /var/log/maillog /var/log/messages
Mailman /usr/local/cpanel/3rdparty/mailmain/logs
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