Application that crashed: kded4
Version of the application: $Id: kded.cpp 1031638 2009-10-05 16:59:11Z lunakl $
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.6-166.fc12.i686.PAE i686

What I was doing when the application crashed:
Every time a message is moved, be it by hand, by filter, or by Expire, KMail crashes.  I have also seen the message, a couple of times:

Could not upload the message dated from <unknown> with subject <unknown> to the server.
The destination folder was: Borgx/Trash
The server reported:
Append aborted

I've no idea whether this is related or not.

 -- Backtrace:
Application: KDE Daemon (kded4), signal: Segmentation fault
[KCrash Handler]
#6  0x05614861 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#7  0x0599f4fa in PackageKit::Transaction::finished(PackageKit::Transaction::ExitStatus, unsigned int) () from /usr/lib/libpackagekit-qt.so.12
#8  0x0599a667 in PackageKit::ClientPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libpackagekit-qt.so.12
#9  0x0599bc63 in PackageKit::ClientPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libpackagekit-qt.so.12
#10 0x05613c0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x05614843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#12 0x007d7350 in QDBusConnectionInterface::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#13 0x007d76ab in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libQtDBus.so.4
#14 0x05613c0c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x05614843 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#16 0x007d71f0 in QDBusConnectionInterface::NameOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/libQtDBus.so.4
#17 0x007d773b in QDBusConnectionInterface::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libQtDBus.so.4
#18 0x007a0a3c in ?? () from /usr/lib/libQtDBus.so.4
#19 0x007a89a8 in ?? () from /usr/lib/libQtDBus.so.4
#20 0x0560df96 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#21 0x05e97b24 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x05e9f281 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x0698e07b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#24 0x055fdd73 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#25 0x055fe972 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#26 0x055feb2e in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#27 0x05628f40 in ?? () from /usr/lib/libQtCore.so.4
#28 0x00c75128 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#29 0x00c78a58 in ?? () from /lib/libglib-2.0.so.0
#30 0x00c78b84 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#31 0x05628b6d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#32 0x05f37356 in ?? () from /usr/lib/libQtGui.so.4
#33 0x055fc2aa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x055fc70a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#35 0x055febf7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#36 0x05e979a8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#37 0x007fd815 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#38 0x0804868c in _start ()

Reported using DrKonqi