Alternativy k NeutronMail pro Software as a Service (SaaS) s licencí open source

• Software as a Service (SaaS)
  Všechny platformy 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
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence