Common Linux log files name and usage

• /var/log/message: General message and system related stuff
• /var/log/auth.log: Authenication logs
• /var/log/kern.log: Kernel logs
• /var/log/cron.log: Crond logs (cron job)
• /var/log/maillog: Mail server logs
• /var/log/qmail/ : Qmail log directory (more files inside this directory)
• /var/log/httpd/: Apache access and error logs directory
• /var/log/lighttpd: Lighttpd access and error logs directory
• /var/log/boot.log : System boot log
• /var/log/mysqld.log: MySQL database server log file
• /var/log/secure: Authentication log
• /var/log/utmp or /var/log/wtmp : Login records files

Postfix Flush the Mail Queue commands

# postfix flush

To see mail queue, enter:
# mailq



To remove all mail from the queue, enter:
# postsuper -d ALL


To remove all mails in the deferred queue, enter:
# postsuper -d ALL deferred