diff --git a/templates/postfix/main.cf.j2 b/templates/postfix/main.cf.j2
index ceba18b..351734e 100644
--- a/templates/postfix/main.cf.j2
+++ b/templates/postfix/main.cf.j2
@@ -119,7 +119,9 @@ transport_maps =
 {% endfor %}
 {% endif %}
 
+{% if postfix_relayhost is defined %}
 relayhost = {{ postfix_relayhost}}
+{% endif %}
 
 {% if postfix_canonical_maps is defined %}
 canonical_maps =