Postfix postfix configuration example for Ubuntu 18.04 LTS (Bionic Beaver)

Get the default configuration file postfix for Postfix, optimized for Ubuntu 18.04 LTS (Bionic Beaver). This example configuration ensures optimal compatibility and performance for Postfix, making it easy to set up and adjust to meet your needs.

Find and download the configuration file here: /etc/init.d/postfix.

For more configurations and setup guides, visit our related files section to further customize your system.

    #!/bin/sh -e

# Start or stop Postfix
#
# LaMont Jones <lamont@debian.org>
# based on sendmail's init.d script

### BEGIN INIT INFO
# Provides:          postfix mail-transport-agent
# Required-Start:    $local_fs $remote_fs $syslog $named $network $time
# Required-Stop:     $local_fs $remote_fs $syslog $named $network
# Should-Start:      postgresql mysql clamav-daemon postgrey spamassassin saslauthd dovecot
# Should-Stop:       postgresql mysql clamav-daemon postgrey spamassassin saslauthd dovecot
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Postfix Mail Transport Agent
# Description:       postfix is a Mail Transport agent
### END INIT INFO

PATH=/bin:/usr/bin:/sbin:/usr/sbin
DAEMON=/usr/sbin/postfix
NAME=Postfix
TZ=
unset TZ

test -x $DAEMON && test -f /etc/postfix/main.cf || exit 0

. /lib/lsb/init-functions
#DISTRO=$(lsb_release -is 2>/dev/null || echo Debian)

enabled_instances() {
	postmulti -l -a | awk '($3=="y") { print $1}'
}

running() {
    INSTANCE="$1"
    if [ "X$INSTANCE" = X ]; then
	    POSTCONF="postconf"
    else
	    POSTCONF="postmulti -i $INSTANCE -x postconf"
    fi

    queue=$($POSTCONF -hx queue_directory 2>/dev/null || echo /var/spool/postfix)
    daemondir=$($POSTCONF -hx daemon_directory 2>/dev/null || echo /usr/lib/postfix/sbin)
    if [ -f ${queue}/pid/master.pid ]; then
	pid=$(sed 's/ //g' ${queue}/pid/master.pid)
	# what directory does the executable live in.  stupid prelink systems.
	dir=$(ls -l /proc/$pid/exe 2>/dev/null | sed 's/.* -> //; s/\/[^\/]*$//')
	if [ "X$dir" = "X${daemondir}" ]; then
	    echo y
	fi
    fi
}

case "$1" in
    start)
	log_daemon_msg "Starting Postfix Mail Transport Agent" postfix
	RET=0
	# for all instances that are not already running, handle chroot setup if needed, and start
	for INSTANCE in $(enabled_instances); do
	    RUNNING=$(running $INSTANCE)
	    if [ "X$RUNNING" = X ]; then
		/usr/lib/postfix/configure-instance.sh $INSTANCE
		CMD="/usr/sbin/postmulti -- -i $INSTANCE -x ${DAEMON}"
		if ! start-stop-daemon --start --exec $CMD quiet-quick-start; then
		    RET=1
		fi
	    fi
	done
	log_end_msg $RET
    ;;

    stop)
	log_daemon_msg "Stopping Postfix Mail Transport Agent" postfix
	RET=0
	# for all instances that are not already running, handle chroot setup if needed, and start
	for INSTANCE in $(enabled_instances); do
	    RUNNING=$(running $INSTANCE)
	    if [ "X$RUNNING" != X ]; then
		CMD="/usr/sbin/postmulti -i $INSTANCE -x ${DAEMON}"
		if ! ${CMD} quiet-stop; then
		    RET=1
		fi
	    fi
	done
	log_end_msg $RET
    ;;

    restart)
        $0 stop
        $0 start
    ;;

    force-reload|reload)
	log_action_begin_msg "Reloading Postfix configuration"
	if ${DAEMON} quiet-reload; then
	    log_action_end_msg 0
	else
	    log_action_end_msg 1
	fi
    ;;

    status)
	ALL=1
	ANY=0
	# for all instances that are not already running, handle chroot setup if needed, and start
	for INSTANCE in $(enabled_instances); do
	    RUNNING=$(running $INSTANCE)
	    if [ "X$RUNNING" != X ]; then
	    	ANY=1
	    else
	    	ALL=0
	    fi
	done
	# handle the case when postmulti returns *no* configured instances
	if [ $ANY = 0 ]; then
	   ALL=0
	fi
	if [ $ALL = 1 ]; then
	   log_success_msg "postfix is running"
	   exit 0
	elif [ $ANY = 1 ]; then
	   log_success_msg "some postfix instances are running"
	   exit 0
	else
	   log_success_msg "postfix is not running"
	   exit 3
	fi
    ;;

    flush|check|abort)
	${DAEMON} $1
    ;;

    *)
	log_action_msg "Usage: /etc/init.d/postfix {start|stop|restart|reload|flush|check|abort|force-reload|status}"
	exit 1
    ;;
esac

exit 0

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