Add a missing endfor.

templates/iptables-rules.v4.j2

@@ -245,6 +245,7 @@
 {% if postfix_smtp_relay_servers is defined %}
 {% for host in postfix_smtp_relay_servers %}
 -A OUTPUT -p tcp -m multiport --dports 25,587,465 -m owner --gid-owner postfix -d {{ host }} -j ACCEPT
+{% endfor %}
 {% else %}
 -A OUTPUT -p tcp -m multiport --dports 25,587,465 -m owner --gid-owner postfix -d {{ postfix_relay_host }} -j ACCEPT
 {% endif %}