Post fix restart produces the following
# tail -f /usr/local/psa/var/log/maillog Mar 4 21:40:07 postfix/postfix-script[24660]: fatal: the Postfix mail system is not running Mar 4 21:40:08 postfix/postfix-script[24731]: starting the Postfix mail system Mar 4 21:40:08 postfix/master[24732]: fatal: bind 0.0.0.0 port 25: Address already in use
Look for multiple instances of smtp inet n – n – – smtpd and comment them out:
#smtp inet n - n - - smtpd localhost:smtp inet n - n - - smtpd smtp_bind_address6= -o smtp_address_preference=ipv4 #smtp inet n - n - - smtpd
Restart postfix
# service postfix restart