diff --git a/groups/locations.py b/groups/locations.py
index beecc51..7bfe757 100644
--- a/groups/locations.py
+++ b/groups/locations.py
@@ -72,6 +72,9 @@ groups['ovh'] = {
     },
     'metadata': {
         'location': 'ovh',
+        'postfix': {
+            'relayhost': '[mx0.kunbox.net]:2525',
+        },
         'users': {
             'debian': {
                 'delete': True,
diff --git a/nodes/htz/ex42-1048908.py b/nodes/htz/ex42-1048908.py
index 6a96d01..4453afd 100644
--- a/nodes/htz/ex42-1048908.py
+++ b/nodes/htz/ex42-1048908.py
@@ -356,6 +356,9 @@ nodes['htz.ex42-1048908'] = {
         'postfix': {
             'myhostname': 'mx0.kunbox.net',
             'message_size_limit_mb': 50,
+            'mynetworks': {
+                'ovh',
+            },
         },
         'postfixadmin': {
             'version': '3.3.8',