[Unit]
Description=Postfix firewall daemon
After=network.target
Before=postfix.service

[Service]
Environment=PIDFILE=/var/run/postfwd.pid
EnvironmentFile=-/etc/default/postfwd
ExecStart=/usr/sbin/postfwd $ARGS --daemon --file $CONF --interface $INET --port $PORT --user $RUNAS --group $RUNAS --pidfile $PIDFILE
ExecStop=/usr/sbin/postfwd --file $CONF --pidfile $PIDFILE --kill
ExecReload=/usr/sbin/postfwd --file $CONF --pidfile $PIDFILE --reload
Type=forking

[Install]
WantedBy=multi-user.target