Trojitá – Qt IMAP email client

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.

Support: Thesis
Developer: Jan Kundrát and many others
License: GNU General Public License version 2 or 3 or any later version


Qt framework (>= 5.2).
CMake (>= 2.8.11).
Optional: the zlib library for the IMAP COMPRESS extension.
Optional: ragel (not required, a pregenerated file is shipped).
Optional: QtKeychain for secure storage of passwords.
Optional: GpgME++ and Mimetic for cryptography (OpenPGP and S/MIME).


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

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