Application that crashed: kontact
Version of the application: 4.3.5
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.13-desktop-1mnb x86_64
Distribution: "Mandriva Linux 2010.0"

What I was doing when the application crashed:
I sent a message with many pdf files in attachment. approx. 10 MB

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  DwStrcasecmp (aStr=@0x7f1c862f07f0, aCstr=0x7f1c6d7059a1 "content-disposition") at /usr/src/debug/kdepim-4.3.5/mimelib/mimelib/string.h:627
#6  0x00007f1c6d6f5035 in DwHeaders::FindField (this=<value optimized out>, aFieldName=0x7f1c6d7059a1 "content-disposition") at /usr/src/debug/kdepim-4.3.5/mimelib/headers.cpp:289
#7  0x00007f1c6d6f5080 in DwHeaders::HasContentDisposition (this=0x7f1c862f07f0) at /usr/src/debug/kdepim-4.3.5/mimelib/headers.cpp:710
#8  0x00007f1c6ea7aac8 in KMMessage::updateAttachmentState (this=0x56a7910, partGiven=<value optimized out>) at /usr/src/debug/kdepim-4.3.5/kmail/kmmessage.cpp:3257
#9  0x00007f1c6eba2998 in KMSender::doSendMsg (this=0x2de3390) at /usr/src/debug/kdepim-4.3.5/kmail/kmsender.cpp:348
#10 0x00007f1c6eba5219 in KMSender::slotResult (this=0x2de3390, job=0x4443030) at /usr/src/debug/kdepim-4.3.5/kmail/kmsender.cpp:725
#11 0x00007f1c6eba5478 in KMSender::qt_metacall (this=0x2de3390, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff5ad2f050)
    at /usr/src/debug/kdepim-4.3.5/build/kmail/kmsender.moc:73
#12 0x00007f1c8601488c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#13 0x00007f1c863e1032 in KJob::result () from /usr/lib64/libkdecore.so.5
#14 0x00007f1c863e13af in KJob::emitResult () from /usr/lib64/libkdecore.so.5
#15 0x00007f1c6e11f543 in MailTransport::SmtpJob::qt_metacall () from /usr/lib64/libmailtransport.so.4
#16 0x00007f1c8601488c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#17 0x00007f1c863e1032 in KJob::result () from /usr/lib64/libkdecore.so.5
#18 0x00007f1c863e13af in KJob::emitResult () from /usr/lib64/libkdecore.so.5
#19 0x00007f1c838f6413 in KIO::SimpleJob::slotFinished () from /usr/lib64/libkio.so.5
#20 0x00007f1c838f68d3 in KIO::TransferJob::slotFinished () from /usr/lib64/libkio.so.5
#21 0x00007f1c838f51e1 in KIO::TransferJob::qt_metacall () from /usr/lib64/libkio.so.5
#22 0x00007f1c8601488c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#23 0x00007f1c839b9c01 in KIO::SlaveInterface::dispatch () from /usr/lib64/libkio.so.5
#24 0x00007f1c839b64b3 in KIO::SlaveInterface::dispatch () from /usr/lib64/libkio.so.5
#25 0x00007f1c839a922d in KIO::Slave::gotInput () from /usr/lib64/libkio.so.5
#26 0x00007f1c839ab3ec in KIO::Slave::qt_metacall () from /usr/lib64/libkio.so.5
#27 0x00007f1c8601488c in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#28 0x00007f1c838c3527 in ?? () from /usr/lib64/libkio.so.5
#29 0x00007f1c838c364d in KIO::Connection::qt_metacall () from /usr/lib64/libkio.so.5
#30 0x00007f1c8600eba9 in QObject::event () from /usr/lib64/libQtCore.so.4
#31 0x00007f1c854ae12c in QApplicationPrivate::notify_helper () from /usr/lib64/libQtGui.so.4
#32 0x00007f1c854b53fe in QApplication::notify () from /usr/lib64/libQtGui.so.4
#33 0x00007f1c8698c3f6 in KApplication::notify () from /usr/lib64/libkdeui.so.5
#34 0x00007f1c85fff6ac in QCoreApplication::notifyInternal () from /usr/lib64/libQtCore.so.4
#35 0x00007f1c860002ba in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib64/libQtCore.so.4
#36 0x00007f1c860280d3 in ?? () from /usr/lib64/libQtCore.so.4
#37 0x00007f1c7e9be4ce in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#38 0x00007f1c7e9c1e98 in ?? () from /usr/lib64/libglib-2.0.so.0
#39 0x00007f1c7e9c1fc0 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f1c86027c73 in QEventDispatcherGlib::processEvents () from /usr/lib64/libQtCore.so.4
#41 0x00007f1c8554164e in ?? () from /usr/lib64/libQtGui.so.4
#42 0x00007f1c85ffdfe2 in QEventLoop::processEvents () from /usr/lib64/libQtCore.so.4
#43 0x00007f1c85ffe3b4 in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#44 0x00007f1c86000569 in QCoreApplication::exec () from /usr/lib64/libQtCore.so.4
#45 0x0000000000403be7 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.3.5/kontact/src/main.cpp:218

Reported using DrKonqi