Alternativas ao NeutronMail para Kubernetes com licença comercial

• Kubernetes
  Todas as plataformas Windows Mac Linux Android iPhone Android Wear iPad Web Self-Hosted Software as a Service (SaaS) PHP JavaScript Windows Mobile Java Mobile S60 Docker Cloudron OpenPGP Kubernetes S/MIME OpenShift DAVdroid
• Licença comercial
  Qualquer licença Licença gratuita Licença Open Source Licença comercial