Trojitá is a Qt-based email client that aims to be fast in operation and function over slow or high-latency networks. It’s desktop agnostic.
Trojitá means “Triple” in English.
The software is released under an open source license.
Features include:
- Modern and straightforward interface.
- Fast in operation.
- Efficient use of network bandwidth, memory usage and battery life – implements IMAP’s QRESYNC, CONDSTORE, ESEARCH, CATENATE, BURL, COMPRESS=DEFLATE, CONTEXT=SORT extensions (and many more).
- Supports many IMAP extensions.
- Robust IMAP core implemented using Qt’s Model-View framework.
- On-demand message list and body part loading.
- Offline IMAP support.
- Support for bandwidth-saving mode aimed at mobile users with expensive connection.
- OpenPGP and S/MIME cryptography.
- Safe and robust dealing with HTML mail.
- IMAP over SSH — in addition to usual SSL/TLS connections, the server can be accessed via SSH.
- Respects open standards and facilitate modern technologies.
- Pure Qt 5 application with no additional dependencies.
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: invent.kde.org/pim/trojita
Support:
Developer: Jan Kundrát and many others
License: GNU General Public License version 2 or 3 or any later version

Trojitá is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| 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 |
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