Symptoms:
The following error message appears when starting postfix daemon:
# service postfix start Starting Postfix Mail Transport Agent: postfixpostfix/postfix-script: fatal: the Postfix mail system is already running failed!
Furthermore, a postfix daemon status reports that postfixis not running:
# service postfix status postfix is not running.
Solution:
Postfix’s master PID file may still be present in /var/spool/postfix/pid directory. Navigate to this directory and remove it:
# cd /var/spool/postfix/pid # ls master.pid # rm master.pid
Once you have removed the above master.pid start your postfix daemon:
# service postfix start Starting Postfix Mail Transport Agent: postfix