diff --git a/bundles/postfix/metadata.py b/bundles/postfix/metadata.py
index f5850b0..ffdf6f6 100644
--- a/bundles/postfix/metadata.py
+++ b/bundles/postfix/metadata.py
@@ -100,8 +100,12 @@ def iptables(metadata):
     'icinga2_api/postfix/services',
 )
 def icinga2(metadata):
-    services = {}
+    if metadata.get('postfix/relayhost', ''):
+        # The system does not send mail on its own. There is no point in
+        # checking it for any listings.
+        return {}
 
+    services = {}
     for ip_type in repo.libs.tools.resolve_identifier(repo, node.name).values():
         for ip in ip_type:
             if not ip.is_private: