diff --git a/charts/postfix/v0.1.0/templates/app.yaml b/charts/postfix/v0.1.0/templates/app.yaml
index 2cace16..41c1c35 100644
--- a/charts/postfix/v0.1.0/templates/app.yaml
+++ b/charts/postfix/v0.1.0/templates/app.yaml
@@ -54,6 +54,9 @@ spec:
             - name: smtp
               containerPort: 25
               protocol: TCP
+            {{- if .Values.postfix.hostPort }}
+              hostPort: {{ .Values.postfix.hostPort }}
+            {{- end }}
           livenessProbe:
             tcpSocket:
                port: 25
diff --git a/charts/postfix/v0.1.0/values.yaml b/charts/postfix/v0.1.0/values.yaml
index 6c031e2..b98d399 100644
--- a/charts/postfix/v0.1.0/values.yaml
+++ b/charts/postfix/v0.1.0/values.yaml
@@ -47,6 +47,7 @@ postfix:
   senderBcc: ""
   kind: StatefulSet
   configuration: ""
+  hostPort: 25
 
 autoscaling:
   enabled: false