MailX

A fast, lightweight, local-first email client — built for every inbox, with AI at its core.

English | 简体中文

[!NOTE]
MailX is in early development. Things may change quickly — issues and pull requests are welcome.

Features

• Fast — A Rust core reads from the local cache first, so MailX opens straight into your mail.
• Lightweight — Built on Tauri with the system WebView instead of bundling a browser engine.
• Cross-platform — Windows, macOS and Linux from a single codebase.
• All in One — Multiple accounts share one unified inbox. MailX is designed for standard IMAP/SMTP mailboxes, and each account can connect directly or through a SOCKS5 or HTTP CONNECT proxy, with no silent fallback to a direct connection.
• Rich-text composing — A lightweight Tiptap editor in its own compose window: headings, bold/italic/underline/strikethrough, links, lists, quotes, alignment, a fixed color palette and Markdown shortcuts. Mail goes out as plain text plus HTML, and the core sanitizes everything you write. Drafts are saved locally, sends can be undone, and a message that may already have been accepted is never resent on its own.
• Local-first & private — Mail is stored and searched on your machine, with no MailX cloud relay. Remote images are off by default, and message bodies render in an isolated sandbox.
• AI-native (planned) — A built-in assistant for reading, organizing and writing, using your own cloud model key or a local model, plus two-way MCP integration. AI never sends mail on its own.
• Self-hostable (planned) — A single-user web version you can deploy with Docker.

Roadmap

The detailed roadmap is in docs/roadmap/README.md (written in Chinese).

Getting Started

Build from source

Prebuilt packages are not available yet.

Prerequisites:

• Bun 1.3.12 (the version pinned in package.json)
• Rust 1.94.0 (pinned in rust-toolchain.toml; rustup installs it on first use)
• Tauri platform dependencies

bun install
bun tauri dev       # run the desktop app in development mode
bun tauri build     # build a release binary (no installer is produced yet)
bun run check       # run the version, type, lint, test, build and Rust checks

See docs/development/README.md for the full list of commands.

Documentation

Documentation is currently written in Chinese.

• Documentation index
• Architecture overview
• Product scope
• AI design
• Development guide

Contributing

Contributions are welcome. Please read CONTRIBUTING.md first. To report a security issue, follow SECURITY.md and report it privately.

License

MailX is licensed under the Apache License 2.0.

Copyright 2026 GuqierMcl and MailX contributors.

MailX is not related to the Unix mailx command.