Alternativ till NeutronMail för Software as a Service (SaaS) med öppen källkodslicens

• Software as a Service (SaaS)
  Alla plattformar 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
• Open Source-licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens