Try smtp with metallb

manifests/mailu/values.yaml

@@ -49,6 +49,19 @@ service:
 front:
   realIpFrom:
     - 192.168.10.0/24
+  externalService:
+    enabled: true
+    type: LoadBalancer
+    externalTrafficPolicy: Cluster
+    ports:
+      smtp: true
+      smtps: false
+      submission: false
+      imap: false
+      imaps: false
+      pop3: false
+      pop3s: false
+      manageSieve: false
 
 dkim:
   enabled: true