Version:           1.10.3 (using 4.1.3 (KDE 4.1.3), Kubuntu packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.27-9-generic

Cannot reproduce, but it happens time after time today:

Anwendung: Kontact (kontact), Signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0xb4c2a6c0 (LWP 29074)]
[New Thread 0xb09e5b90 (LWP 1483)]
[KCrash handler]
#6  KMail::FolderJob::msgList (this=0xa20aa28)
    at /usr/include/qt4/QtCore/qatomic_i386.h:116
#7  0xb15d7506 in KMAcctImap::ignoreJobsForMessage (this=0x9b5dcb8, 
    msg=0x9c353b0) at /build/buildd/kdepim-4.1.3/kmail/kmacctimap.cpp:216
#8  0xb15f0175 in KMFolderImap::ignoreJobsForMessage (this=0x9a6dd80, 
    msg=0x9c353b0) at /build/buildd/kdepim-4.1.3/kmail/kmfolderimap.cpp:1552
#9  0xb170965e in KMMoveCommand::execute (this=0x9e956b8)
    at /build/buildd/kdepim-4.1.3/kmail/kmcommands.cpp:2094
#10 0xb16ed112 in KMCommand::slotPostTransfer (this=0x9e956b8, 
    result=KMCommand::OK)
    at /build/buildd/kdepim-4.1.3/kmail/kmcommands.cpp:273
#11 0xb16f87c4 in KMCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xbfd18b4c)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:86
#12 0xb170b43a in KMMoveCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfd18b4c)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:1662
#13 0xb170b502 in KMDeleteMsgCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfd18b4c)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:1712
#14 0xb7e03a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb7e047e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb16e97a3 in KMCommand::messagesTransfered (this=0x9e956b8, 
    _t1=KMCommand::OK)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:100
#17 0xb1707ef4 in KMCommand::transferSelectedMsgs (this=0x9e956b8)
    at /build/buildd/kdepim-4.1.3/kmail/kmcommands.cpp:367
#18 0xb170819b in KMCommand::slotStart (this=0x9e956b8)
    at /build/buildd/kdepim-4.1.3/kmail/kmcommands.cpp:265
#19 0xb16f87d3 in KMCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbfd18d48)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:85
#20 0xb170b43a in KMMoveCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd18d48)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:1662
#21 0xb170b502 in KMDeleteMsgCommand::qt_metacall (this=0x9e956b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd18d48)
    at /build/buildd/kdepim-4.1.3/obj-i486-linux-gnu/kmail/kmcommands.moc:1712
#22 0xb7e03a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb7e047e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb7e09db7 in ?? () from /usr/lib/libQtCore.so.4
#25 0xb7e09edc in ?? () from /usr/lib/libQtCore.so.4
#26 0xb7dfe53f in QObject::event () from /usr/lib/libQtCore.so.4
#27 0xb6df58ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#28 0xb6dfd72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#29 0xb78f0b2d in KApplication::notify (this=0xbfd19488, receiver=0xa0f2620, 
    event=0xbfd191dc)
    at /build/buildd/kde4libs-4.1.3/kdeui/kernel/kapplication.cpp:311
#30 0xb7deee61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#31 0xb7e1cd81 in ?? () from /usr/lib/libQtCore.so.4
#32 0xb7e19520 in ?? () from /usr/lib/libQtCore.so.4
#33 0xb69ca6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb69cdda3 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb69cdf61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7e19478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#37 0xb6e8fea5 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb7ded52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#39 0xb7ded6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#40 0xb7defda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#41 0xb6df5767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#42 0x0804bf52 in main (argc=1, argv=0xbfd19784)
    at /build/buildd/kdepim-4.1.3/kontact/src/main.cpp:218
#0  0xb7f19430 in __kernel_vsyscall ()