apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: mailu-network-policy
  namespace: bakery-ia
  labels:
    app: mailu
    component: network-policy
spec:
  # Apply to all Mailu pods (matches mailu-deployment.yaml labels)
  podSelector:
    matchLabels:
      app: mailu
  policyTypes:
    - Ingress
    - Egress
  ingress:
    # Allow SMTP from notification-service
    - from:
        - podSelector:
            matchLabels:
              app: notification-service
      ports:
        - port: 25
        - port: 587
    # Allow SMTP from other internal services that may need to send email
    - from:
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: bakery-ia
      ports:
        - port: 587
    # Allow webmail/admin access via ingress controller
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: ingress-nginx
      ports:
        - port: 80
        - port: 443
    # Allow internal Mailu component communication
    - from:
        - podSelector:
            matchLabels:
              app: mailu
      ports:
        - port: 25
        - port: 587
        - port: 143
        - port: 993
        - port: 80
        - port: 11333
        - port: 11334
  egress:
    # Allow relay to external SMTP (Mailgun)
    - to:
        - ipBlock:
            cidr: 0.0.0.0/0
            except:
              - 10.0.0.0/8
              - 172.16.0.0/12
              - 192.168.0.0/16
      ports:
        - port: 587
        - port: 465
        - port: 25
    # Allow internal Mailu component communication
    - to:
        - podSelector:
            matchLabels:
              app: mailu
      ports:
        - port: 25
        - port: 587
        - port: 143
        - port: 993
        - port: 80
        - port: 11333
        - port: 11334
    # Allow connection to shared Redis (database 15)
    - to:
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: redis
      ports:
        - port: 6379
    # Allow DNS lookups
    - to: []
      ports:
        - port: 53
          protocol: UDP
        - port: 53
          protocol: TCP