meli

Supports multiple backends including IMAP, Maildir, notmuch, JMAP, and NNTP, allowing unified management of diverse email sources in a single interface, as listed in the README.

Built with async Rust for multithreaded, non-blocking operations, ensuring responsive performance even with large email volumes, as emphasized in the key features.

Embeds an xterm-compatible terminal editor for composing emails, enabling users to use preferred editors like Vim or Emacs directly within meli, as highlighted in the features.

Highly configurable via TOML files with per-mailbox and per-account setting overrides, plus extensive theming support, allowing tailored workflows as described in the documentation.