Astroid is a lightweight and fast Mail User Agent that provides a graphical interface to searching, display and composing email, organized in thread and tags. Astroid draws inspiration from the Sup mail user agent.
Astroid uses the notmuch backend for fast searches through tons of email. Astroid searches, displays and compose emails — and relies on other programs for fetching, syncing and sending email.
This is free and open source software.
Key Features
- Lightweight and fast.
- Fully operable by keyboard.
- Graphical interface with buffers that can be placed in separate windows.
- Display HTML mail and common attachments inline.
- Themable and configurable.
- Built-in crypto (PGP/MIME) support.
- Editors: embedded or external vim or emacs (or your favourite editor).
- Syntax highlighting of patches and code segments.
- Python and Lua plugins.
Website: astroidmail.github.io
Support: GitHub Code Repository
Developer: Gaute Hope
License: GNU General Public License v3.0

Astroid is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| Graphical Email Clients | |
|---|---|
| Thunderbird | Popular free, cross-platform e-mail, RSS and newsgroup client |
| Kmail | Email component of Kontact |
| Sylpheed | Simple, lightweight client |
| Mailspring | New version of Nylas Mail |
| Claws Mail | Lightweight yet powerful and full-featured client |
| Evolution | Provides integrated mail, addressbook and calendaring functionality |
| Geary | Mail client for GNOME written in Vala |
| Astroid | Lightweight and fast Mail User Agent |
| Balsa | Email client for GNOME |
| Also known as Pantheon Mail | |
| Dodo | Based on the command line email swiss-army-knife notmuch |
| Aerion | Standalone lightweight e-mail client inspired by Geary |
Read our verdict in the software roundup.
| Lightweight Email Clients | |
|---|---|
| Sylpheed | Client also based on the GTK+ GUI toolkit |
| Claws Mail | Powerful, user-friendly, fast and full-featured mail client based on GTK+ |
| Geary | Lightweight mail client for GNOME that is written in Vala |
| Astroid | Lightweight and fast Mail User Agent |
| Trojitá | Qt-based IMAP email client |
| Aerion | Lightweight e-mail client inspired by Geary |
Read our verdict in the software roundup.
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