Application that crashed: kontact
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
(sorry for english) I deleted my mail account in kmail (by kontact). Some errors (KMessageBox) was shown with messages like: Can't find file: .../file/from/imap/dir/on/local/drive/*. Aftrer than program crashed

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 0 (LWP 3978)]

Thread 3 (Thread 0x7fc7d236e910 (LWP 3988)):
#0  0x00007fc7ea381dd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc7eedf734b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fc7e8a4b44c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fc7eedf6285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc7ea37d57a in start_thread () from /lib/libpthread.so.0
#5  0x00007fc7edc5116d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fc7d0a69910 (LWP 4025)):
#0  0x00007fc7ea38205d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc7eedf72b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fc7eeded412 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fc7eedf6285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc7ea37d57a in start_thread () from /lib/libpthread.so.0
#5  0x00007fc7edc5116d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc7f05c7760 (LWP 3978)):
[KCrash Handler]
#5  0x00007fc7eeeeca45 in QObject::connect () from /usr/lib/libQtCore.so.4
#6  0x00007fc7d915e943 in KMFolderImap::reallyGetFolder () from /usr/lib/libkmailprivate.so.4
#7  0x00007fc7d916ccd9 in KMFolderImap::slotCheckValidityResult () from /usr/lib/libkmailprivate.so.4
#8  0x00007fc7d916f5f5 in KMFolderImap::qt_metacall () from /usr/lib/libkmailprivate.so.4
#9  0x00007fc7eeef0dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0x00007fc7ef2c54e2 in KJob::result () from /usr/lib/libkdecore.so.5
#11 0x00007fc7ef2c585f in KJob::emitResult () from /usr/lib/libkdecore.so.5
#12 0x00007fc7ec7c6a53 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#13 0x00007fc7ec7c6f13 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#14 0x00007fc7ec7c5821 in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#15 0x00007fc7eeef0dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0x00007fc7ec8875d1 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#17 0x00007fc7ec883e83 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#18 0x00007fc7ec876cad in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#19 0x00007fc7ec878dcc in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#20 0x00007fc7eeef0dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#21 0x00007fc7ec794527 in KIO::ConnectionPrivate::dequeue () from /usr/lib/libkio.so.5
#22 0x00007fc7ec79464d in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#23 0x00007fc7eeeeb109 in QObject::event () from /usr/lib/libQtCore.so.4
#24 0x00007fc7ee38769c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#25 0x00007fc7ee38e96e in QApplication::notify () from /usr/lib/libQtGui.so.4
#26 0x00007fc7ef879ff6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#27 0x00007fc7eeedbcec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#28 0x00007fc7eeedc8ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#29 0x00007fc7eef04543 in ?? () from /usr/lib/libQtCore.so.4
#30 0x00007fc7e7cecdbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007fc7e7cf0568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#32 0x00007fc7e7cf0690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007fc7eef041b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#34 0x00007fc7ee41a64e in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007fc7eeeda5f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#36 0x00007fc7eeeda9c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#37 0x00007fc7eeedcb79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#38 0x0000000000403ef7 in _start ()

Reported using DrKonqi