Outlook 的开源替代

跨平台开源邮件客户端 — :love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.

↔ 开源替代 Apple Mail、Outlook

端到端加密邮件服务 — Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.

↔ 开源替代 Gmail、Outlook、ProtonMail

Windows邮件与日历客户端 — Built-in Mail & Calendars app clone for Windows.

↔ 开源替代 Outlook