Version:           1.8.2 (using KDE 3.4.2, Kubuntu Package 4:3.4.2-0ubuntu0hoary2 )
Compiler:          gcc version 3.3.5 (Debian 1:3.3.5-8ubuntu2)
OS:                Linux (i686) release 2.6.10-5-386

If you select an gnupg-encrypted mail and abort the question for the passphrase two times, KMail will crash.

This is the crashlog you will receive:

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
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[Thread debugging using libthread_db enabled]
[New Thread -1208085248 (LWP 7620)]
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[KCrash handler]
#4  0x47dcfb60 in KMail::ObjectTreeParser::parseObjectTree ()
   from /usr/lib/libkmailprivate.so
#5  0x47ce7a89 in KMReaderWin::parseMsg () from /usr/lib/libkmailprivate.so
#6  0x47ce7403 in KMReaderWin::displayMessage ()
   from /usr/lib/libkmailprivate.so
#7  0x47ce6fb8 in KMReaderWin::updateReaderWin ()
   from /usr/lib/libkmailprivate.so
#8  0x47cee20a in KMReaderWin::qt_invoke () from /usr/lib/libkmailprivate.so
#9  0x46b84067 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#10 0x46b83eae in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0x46ea119d in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#12 0x46ba3c05 in QTimer::event () from /usr/lib/libqt-mt.so.3
#13 0x46b2c370 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#14 0x46b2b9d4 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#15 0x44c10865 in KApplication::notify () from /usr/lib/libkdecore.so.4
#16 0x46b1c858 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#17 0x46ad895f in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#18 0x46b3d74c in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#19 0x46b3d60e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#20 0x46b2c57b in QApplication::exec () from /usr/lib/libqt-mt.so.3
#21 0x0804a0b4 in ?? ()
#22 0xbffff940 in ?? ()
#23 0xbffff850 in ?? ()
#24 0x00000000 in ?? ()
#25 0x00000000 in ?? ()
#26 0x46fa2ee0 in vtable for QGArray () from /usr/lib/libqt-mt.so.3
#27 0x081b7938 in ?? ()
#28 0x476f9de0 in __after_morecore_hook () from /lib/tls/i686/cmov/libc.so.6
#29 0x476f9a28 in __after_morecore_hook () from /lib/tls/i686/cmov/libc.so.6
#30 0x47f846f0 in vtable for KMKernel () from /usr/lib/libkmailprivate.so
#31 0x475e48c8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#32 0x475e48c8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#33 0x08049e11 in ?? ()