Email Client GitHub Repositories (2026) · Open Source Tools

MailCraft: an open-source, clean-room mail, calendar and contacts program in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.

Mail and calendar for Linux and macOS. Gmail and IMAP accounts, Google Calendar, contacts, OpenPGP and S/MIME. GTK4 and libadwaita, written in Rust.

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and about 20 MB of private memory at idle.

Terminal-based email client for Linux and macOS

High throughput Go SMTP pool library with graceful handling of idle timeouts, errors, and retries.

📨 An open-source email client built around your privacy, cross-platform with zero telemetry, fully yours.

An open-source, clean-room, local-first alternative to Microsoft Outlook in pure Rust