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 2.6.11.12

Note: I'd perform an initial crash analisys, but have no clue of where the core files are placed!!

Here's the backtrace:

#4  0xb69b7ff5 in DwStrcasecmp () from /usr/lib/libmimelib.so.1
#5  0xb69a90e4 in DwHeaders::FindField () from /usr/lib/libmimelib.so.1
#6  0xb7c5856a in KMMessage::headerField () from /usr/lib/libkmailprivate.so
#7  0xb7c56b65 in KMMessage::from () from /usr/lib/libkmailprivate.so
#8  0xb7dfd92b in KMail::FancyHeaderStyle::format ()
   from /usr/lib/libkmailprivate.so
#9  0xb7d1bbef in KMReaderWin::writeMsgHeader ()
   from /usr/lib/libkmailprivate.so
#10 0xb7d1b39a in KMReaderWin::parseMsg () from /usr/lib/libkmailprivate.so
#11 0xb7d1adc3 in KMReaderWin::displayMessage ()
   from /usr/lib/libkmailprivate.so
#12 0xb7d1a978 in KMReaderWin::updateReaderWin ()
   from /usr/lib/libkmailprivate.so
#13 0xb7d21bca in KMReaderWin::qt_invoke () from /usr/lib/libkmailprivate.so
#14 0xb7230067 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb722feae in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#16 0xb754d19d in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#17 0xb724fc05 in QTimer::event () from /usr/lib/libqt-mt.so.3
#18 0xb71d8370 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#19 0xb71d79d4 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#20 0xb775c8a5 in KApplication::notify () from /usr/lib/libkdecore.so.4
#21 0xb71c8858 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#22 0xb718495f in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#23 0xb71e974c in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#24 0xb71e960e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#25 0xb71d857b in QApplication::exec () from /usr/lib/libqt-mt.so.3
#26 0x0804a0b4 in ?? ()
#27 0xbffff980 in ?? ()
#28 0xbffff890 in ?? ()
#29 0x00000000 in ?? ()
#30 0x00000000 in ?? ()
#31 0xb764eee0 in vtable for QGArray () from /usr/lib/libqt-mt.so.3
#32 0x08104118 in ?? ()
#33 0xb7a13de0 in __after_morecore_hook () from /lib/tls/i686/cmov/libc.so.6
#34 0xb7a13a28 in __after_morecore_hook () from /lib/tls/i686/cmov/libc.so.6
#35 0xb7fb80b0 in vtable for KMKernel () from /usr/lib/libkmailprivate.so
#36 0xb78fe8c8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#37 0xb78fe8c8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#38 0x08049e11 in ?? ()