Version:           1.11.4 (using 4.2.4 (KDE 4.2.4) "release 2", KDE:42 / openSUSE_11.0)
Compiler:          gcc
OS:                Linux (x86_64) release 2.6.25.20-0.5-default

When I hit send to send a reply email KMail crashed with the following stack trace:

Application: KMail (kmail), signal SIGSEGV
0x00007f60abb30ce1 in nanosleep () from /lib64/libc.so.6

Thread 1 (process 26006):
[KCrash Handler]
#5  RecipientsView::recipients (this=0x2065636966666f6b) at /usr/include/QtCore/qlist.h:113
#6  0x00007f60aff5da75 in RecipientsEditor::recipientString (this=<value optimized out>, type=Recipient::Cc) at /usr/src/debug/kdepim-4.2.4/kmail/recipientseditor.cpp:947
#7  0x00007f60afca9ca5 in KMComposeWin::cc (this=<value optimized out>) at /usr/src/debug/kdepim-4.2.4/kmail/kmcomposewin.cpp:1417
#8  0x00007f60afcc1308 in KMComposeWin::doSend (this=0x84bbb0, method=<value optimized out>, saveIn=KMComposeWin::None) at /usr/src/debug/kdepim-4.2.4/kmail/kmcomposewin.cpp:3485
#9  0x00007f60afcc2fc7 in KMComposeWin::slotSendNow (this=0x84bbb0) at /usr/src/debug/kdepim-4.2.4/kmail/kmcomposewin.cpp:3763
#10 0x00007f60afcd25ba in KMComposeWin::qt_metacall (this=0x84bbb0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffb90d06f0)
    at /usr/src/debug/kdepim-4.2.4/build/kmail/kmcomposewin.moc:240
#11 0x00007f60ad939284 in QMetaObject::activate (sender=0x47be580, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x4b3c530) at kernel/qobject.cpp:3031
#12 0x00007f60ac6f24f7 in QAction::triggered (this=0x7fffb90cfd70, _t1=false) at .moc/release-shared/moc_qaction.cpp:216
#13 0x00007f60ac6f2cc0 in QAction::activate (this=0x47be580, event=<value optimized out>) at kernel/qaction.cpp:1125
#14 0x00007f60aca04afa in QAbstractButtonPrivate::click (this=0x4a110c0) at widgets/qabstractbutton.cpp:520
#15 0x00007f60aca04d95 in QAbstractButton::mouseReleaseEvent (this=0x49ee250, e=0x7fffb90d0ec0) at widgets/qabstractbutton.cpp:1110
#16 0x00007f60acacca6a in QToolButton::mouseReleaseEvent (this=0x7fffb90cfd70, e=0x2065636966666f6b) at widgets/qtoolbutton.cpp:671
#17 0x00007f60ac74a9a9 in QWidget::event (this=0x7fffb90cfd70, event=0x7fffb90d0ec0) at kernel/qwidget.cpp:7163
#18 0x00007f60ac6f817d in QApplicationPrivate::notify_helper (this=0x63c780, receiver=0x49ee250, e=0x7fffb90d0ec0) at kernel/qapplication.cpp:3803
#19 0x00007f60ac70079a in QApplication::notify (this=<value optimized out>, receiver=0x49ee250, e=0x7fffb90d0ec0) at kernel/qapplication.cpp:3528
#20 0x00007f60b0ad31bb in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#21 0x00007f60ad924e81 in QCoreApplication::notifyInternal (this=0x7fffb90d1e20, receiver=0x49ee250, event=0x7fffb90d0ec0) at kernel/qcoreapplication.cpp:587
#22 0x00007f60ac6ffb38 in QApplicationPrivate::sendMouseEvent (receiver=0x49ee250, event=0x7fffb90d0ec0, alienWidget=0x49ee250, nativeWidget=0x84bbb0, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7f60ad075760) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:212
#23 0x00007f60ac764299 in QETWidget::translateMouseEvent (this=0x84bbb0, event=<value optimized out>) at kernel/qapplication_x11.cpp:4042
#24 0x00007f60ac762cb7 in QApplication::x11ProcessEvent (this=0x57, event=0x7fffb90d1940) at kernel/qapplication_x11.cpp:3160
#25 0x00007f60ac78959c in x11EventSourceDispatch (s=0x64d470, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:142
#26 0x00007f60a2d9795a in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#27 0x00007f60a2d9b060 in ?? () from /usr/lib64/libglib-2.0.so.0
#28 0x00007f60a2d9b1fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#29 0x00007f60ad94d3af in QEventDispatcherGlib::processEvents (this=0x63c380, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#30 0x00007f60ac788d0f in QGuiEventDispatcherGlib::processEvents (this=0x7fffb90cfd70, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:198
#31 0x00007f60ad923782 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1190323152}) at kernel/qeventloop.cpp:143
#32 0x00007f60ad92390d in QEventLoop::exec (this=0x7fffb90d1c70, flags={i = -1190323072}) at kernel/qeventloop.cpp:194
#33 0x00007f60ad925dfd in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#34 0x0000000000402dcb in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.2.4/kmail/main.cpp:146