具有开源许可证的所有平台的CloudEmail.io替代品

• 所有平台
  所有平台 Windows Mac Linux Chrome OS Android iPhone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) Windows Mobile Java Mobile F-Droid S60 Android TV Chrome MetaMask OpenPGP PureOS (Purism) S/MIME DAVdroid
• 开源许可证
  任何牌照 免费许可证 开源许可证 商业牌照