diff --git a/charts/mail-relay/templates/networkpolicy.yaml b/charts/mail-relay/templates/networkpolicy.yaml
new file mode 100644
index 0000000..0e74e02
--- /dev/null
+++ b/charts/mail-relay/templates/networkpolicy.yaml
@@ -0,0 +1,15 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: np-{{ include "mail-relay.fullname" . }}
+  labels:
+    {{- include "mail-relay.labels" . | nindent 4 }}
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "mail-relay.name" . }}
+  policyTypes:
+    - Ingress
+  ingress:
+    - ports:
+        - port: 587