This is Trojita, a Qt IMAP e-mail client.
Features:
* A pure Qt4 (and Qt5!) application with no additional dependencies
* Robust IMAP core implemented using Qt's Model-View framework
* Standards compliance is a design goal
* On-demand message list and body part loading
* Offline IMAP support
* Support for bandwidth-saving mode aimed at mobile users with
expensive connection
* IMAP over SSH -- in addition to usual SSL/TLS connections, the
server could be accessed via SSH
* Safe and robust dealing with HTML mail