diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 254dc8e..234cea8 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -976,6 +976,25 @@ else
 	echo_skipped
 fi
 
+echononl "   Enable Postfix firewall daemon at boot time .."
+if $systemd_exists ; then
+   systemctl enable postfwd > /dev/null 2> $tmp_err_msg
+   if [[ $? -eq 0 ]] ; then
+      echo_ok
+   else
+      echo_failed
+      error "$(cat $tmp_err_msg)"
+   fi
+else
+   update-rc.d postfwd defaults > /dev/null 2> $tmp_err_msg
+   if [[ $? -eq 0 ]] ; then
+      echo_ok
+   else
+      echo_failed
+      error "$(cat $tmp_err_msg)"
+   fi
+fi
+
 echononl "   Restart Postfix firewall daemon 'postfwd'.."
 if $systemd_exists ; then
    systemctl restart postfwd > /dev/null 2> $tmp_err_msg