Version:           1.9.6 (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

As per short description: when using the menu to select "find message", I can cause a replicatable crash each time I use more then one variable (although I have not tested all possible single variable searches).

This is the backtrace form the crash reporter:
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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 47116420079088 (LWP 16399)]
[New Thread 1107310912 (LWP 16403)]
[New Thread 1098918208 (LWP 16402)]
[New Thread 1090525504 (LWP 16401)]
[New Thread 1082132800 (LWP 16400)]
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[KCrash handler]
#5  0x00002ada1a66cff2 in KMMessage::headerFields ()
   from /usr/lib/libkmailprivate.so
#6  0x00002ada1a71c439 in KMSearchRuleString::matches ()
   from /usr/lib/libkmailprivate.so
#7  0x00002ada1a4f274f in KMSearchPattern::matches ()
   from /usr/lib/libkmailprivate.so
#8  0x00002ada1a63b5c8 in KMSearchPattern::matches ()
   from /usr/lib/libkmailprivate.so
#9  0x00002ada1a63b9bf in FolderStorage::slotProcessNextSearchBatch ()
   from /usr/lib/libkmailprivate.so
#10 0x00002ada1a57d95d in KMSearch::slotProcessNextBatch ()
   from /usr/lib/libkmailprivate.so
#11 0x00002ada1a57da1e in KMSearch::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#12 0x00002ada1c0d6ce2 in QObject::activate_signal ()
   from /usr/lib/libqt-mt.so.3
#13 0x00002ada1c0d787c in QObject::activate_signal ()
   from /usr/lib/libqt-mt.so.3
#14 0x00002ada1c446a1a in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#15 0x00002ada1c0fd1a3 in QTimer::event () from /usr/lib/libqt-mt.so.3
#16 0x00002ada1c0721d6 in QApplication::internalNotify ()
   from /usr/lib/libqt-mt.so.3
#17 0x00002ada1c073f65 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#18 0x00002ada1b7847a8 in KApplication::notify ()
   from /usr/lib/libkdecore.so.4
#19 0x00002ada1c004cc2 in QApplication::sendEvent ()
   from /usr/lib/libqt-mt.so.3
#20 0x00002ada1c065490 in QEventLoop::activateTimers ()
   from /usr/lib/libqt-mt.so.3
#21 0x00002ada1c0193ef in QEventLoop::processEvents ()
   from /usr/lib/libqt-mt.so.3
#22 0x00002ada1c08b70b in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#23 0x00002ada1c08b513 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#24 0x00002ada1c073c9c in QApplication::exec () from /usr/lib/libqt-mt.so.3
#25 0x0000000000402b84 in ?? ()
#26 0x00002ada1b2718e4 in __libc_start_main () from /lib/libc.so.6
#27 0x00000000004028f9 in ?? ()
#28 0x00007fff90a454a8 in ?? ()
#29 0x0000000000000000 in ?? ()