Version:            (using KDE KDE 3.3.91)
Installed from:    SuSE RPMs

KMail just crashed on me.  At the time, I was forwarding a MIME multi-part text/HTML message as inline.  The HTML portion showed up in the composer window as an attachment.  I right-clicked on the HTML portion and clicked on the option to remove it.  KMail then crashed with the following backtrace.  I will let you know if it happens again.

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Using host libthread_db library "/lib/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 1970)]
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[KCrash handler]
#4  0x4203d262 in QGArray::QGArray () from /usr/lib/qt3/lib/libqt-mt.so.3
#5  0x4044de99 in QMemArray<char>::QMemArray ()
   from /opt/kde3/lib/libkmailprivate.so.0
#6  0x401c6b9f in KMMessage::createDWBodyPart ()
   from /opt/kde3/lib/libkmailprivate.so.0
#7  0x401c7cc9 in KMMessage::addBodyPart ()
   from /opt/kde3/lib/libkmailprivate.so.0
#8  0x403d7c37 in MessageComposer::addBodyAndAttachments ()
   from /opt/kde3/lib/libkmailprivate.so.0
#9  0x403d7413 in MessageComposer::encryptMessage ()
   from /opt/kde3/lib/libkmailprivate.so.0
#10 0x404adb85 in EncryptMessageJob::execute ()
   from /opt/kde3/lib/libkmailprivate.so.0
#11 0x403d10e9 in MessageComposer::slotDoNextJob ()
   from /opt/kde3/lib/libkmailprivate.so.0
#12 0x403dafe8 in MessageComposer::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so.0
#13 0x41d8331b in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0x420c9cba in QSignal::signal () from /usr/lib/qt3/lib/libqt-mt.so.3
#15 0x41d9e22f in QSignal::activate () from /usr/lib/qt3/lib/libqt-mt.so.3
#16 0x41da5ec3 in QSingleShotTimer::event ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#17 0x41d213b6 in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0x41d206de in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#19 0x4188f31e in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#20 0x41d0da43 in QEventLoop::activateTimers ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#21 0x41cc5ee7 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#22 0x41d34100 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#23 0x41d216af in QApplication::enter_loop ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#24 0x402529ff in KMComposeWin::deadLetter ()
   from /opt/kde3/lib/libkmailprivate.so.0
#25 0x4032474a in KMKernel::dumpDeadLetters ()
   from /opt/kde3/lib/libkmailprivate.so.0
#26 0x40326990 in KMKernel::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so.0
#27 0x41d8331b in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#28 0x41d830e4 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#29 0x420cc109 in QTimer::timeout () from /usr/lib/qt3/lib/libqt-mt.so.3
#30 0x41da5bb3 in QTimer::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#31 0x41d213b6 in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#32 0x41d206de in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#33 0x4188f31e in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#34 0x41d0da43 in QEventLoop::activateTimers ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#35 0x41cc5ee7 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#36 0x41d34100 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#37 0x41d33ff6 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#38 0x41d2164f in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#39 0x0804a38f in main ()