dev-environment/k8s_config/dev/smtp4dev/service.yaml

apiVersion: v1
kind: Service
metadata:
  name: smtp4dev
spec:
  selector:
    app: smtp4dev
  ports:
  - name: http
    port: 80
    targetPort: 80
  - name: smtp
    port: 25
    targetPort: 25
  - name: imap
    port: 143
    targetPort: 143