Version:           1.10.4 (using KDE 4.1.3)
Compiler:          gcc version 4.3.1 Configured with: /var/tmp/portage/sys-devel/gcc-4.3.1-r1/work/gcc-4.3.1/configure --prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.3.1 --includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.3.1/include --datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.1 --mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.1/man --infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.1/info --with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.3.1/include/g++-v4 --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec --disable-fixed-point --enable-nls --without-included-gettext --with-system-zlib --disable-checking --disable-werror --enable-secureplt --disable-multilib --enable-libmudflap --disable-libssp --enable-libgomp --enable-cld --disable-libgcj --with-arch=i686 --enable-languages=c,c++,treelang,fortran --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.3.1-r1 p1.1'
OS:                Linux
Installed from:    Gentoo Packages

Please note this is 4.1.4 but the wizard did not have that as a choice. This also occurred in 4.1.3.

Some versions:
xorg-server 1.5.3
qt 4.4.2

To reproduce:

go to imap email folder and start deleting.
At about the second too fifth email deleted, kmail will crash with the following backtrace:

Application: KMail (kmail), signal SIGSEGV
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 0 (LWP 16841)]

Thread 2 (Thread 0xb195ab90 (LWP 16870)):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb7cedb7c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7d61e98 in QWaitCondition::wait () from /usr/lib/qt4/libQtCore.so.4
#3  0xb7d57d20 in ?? () from /usr/lib/qt4/libQtCore.so.4
#4  0xb7d60df5 in ?? () from /usr/lib/qt4/libQtCore.so.4
#5  0xb7cea080 in start_thread () from /lib/libpthread.so.0
#6  0xb4ee4f4e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb460f6d0 (LWP 16841)):
[KCrash Handler]
#6  0xb7532c75 in QList (this=0xbf93cf28, l=@0xffff0008) at /usr/include/qt4/QtCore/qlist.h:113
#7  0xb770539c in KMail::FolderJob::msgList (this=0xffff0000) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/folderjob.cpp:120
#8  0xb75f3ea2 in KMAcctImap::ignoreJobsForMessage (this=0x823b590, msg=0x877eef0) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmacctimap.cpp:216
#9  0xb76065b7 in KMFolderImap::ignoreJobsForMessage (this=0x823dd90, msg=0x877eef0) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmfolderimap.cpp:1564
#10 0xb76c27aa in KMMoveCommand::execute (this=0x8982dc8) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmcommands.cpp:2090
#11 0xb76d0cc2 in KMCommand::slotPostTransfer (this=0x8982dc8, result=KMCommand::OK) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmcommands.cpp:273
#12 0xb76d0d8c in KMCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xbf93d1ec) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:86
#13 0xb76d1317 in KMMoveCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbf93d1ec)
    at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:1662
#14 0xb76d13cb in KMDeleteMsgCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbf93d1ec)
    at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:1712
#15 0xb7e5784d in QMetaObject::activate () from /usr/lib/qt4/libQtCore.so.4
#16 0xb7e58561 in QMetaObject::activate () from /usr/lib/qt4/libQtCore.so.4
#17 0xb76b9436 in KMCommand::messagesTransfered (this=0x8982dc8, _t1=KMCommand::OK) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:100
#18 0xb76d0a96 in KMCommand::transferSelectedMsgs (this=0x8982dc8) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmcommands.cpp:367
#19 0xb76d1e1e in KMCommand::slotStart (this=0x8982dc8) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/kmcommands.cpp:265
#20 0xb76d0d99 in KMCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbf93d448) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:85
#21 0xb76d1317 in KMMoveCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf93d448)
    at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:1662
#22 0xb76d13cb in KMDeleteMsgCommand::qt_metacall (this=0x8982dc8, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf93d448)
    at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail_build/kmail/kmcommands.moc:1712
#23 0xb7e5784d in QMetaObject::activate () from /usr/lib/qt4/libQtCore.so.4
#24 0xb7e58561 in QMetaObject::activate () from /usr/lib/qt4/libQtCore.so.4
#25 0xb7e5dae8 in ?? () from /usr/lib/qt4/libQtCore.so.4
#26 0xb7e5dbe1 in ?? () from /usr/lib/qt4/libQtCore.so.4
#27 0xb7e52a60 in QObject::event () from /usr/lib/qt4/libQtCore.so.4
#28 0xb534c443 in QApplicationPrivate::notify_helper () from /usr/lib/qt4/libQtGui.so.4
#29 0xb5353bba in QApplication::notify () from /usr/lib/qt4/libQtGui.so.4
#30 0xb5e2c6a2 in KApplication::notify (this=0xbf93dd18, receiver=0x87ed9f0, event=0xbf93d8ec) at /var/tmp/portage/kde-base/kdelibs-4.1.4/work/kdelibs-4.1.4/kdeui/kernel/kapplication.cpp:311
#31 0xb7e4441c in QCoreApplication::notifyInternal () from /usr/lib/qt4/libQtCore.so.4
#32 0xb7e6e36e in ?? () from /usr/lib/qt4/libQtCore.so.4
#33 0xb7e6e5ed in QEventDispatcherUNIX::processEvents () from /usr/lib/qt4/libQtCore.so.4
#34 0xb53db4d5 in ?? () from /usr/lib/qt4/libQtGui.so.4
#35 0xb7e42d0f in QEventLoop::processEvents () from /usr/lib/qt4/libQtCore.so.4
#36 0xb7e42ed0 in QEventLoop::exec () from /usr/lib/qt4/libQtCore.so.4
#37 0xb7e4519d in QCoreApplication::exec () from /usr/lib/qt4/libQtCore.so.4
#38 0xb534c2f4 in QApplication::exec () from /usr/lib/qt4/libQtGui.so.4
#39 0x0804ade8 in main (argc=) at /var/tmp/portage/kde-base/kmail-4.1.4/work/kmail-4.1.4/kmail/main.cpp:146
#40 0xb4e34005 in __libc_start_main () from /lib/libc.so.6
#41 0x0804a241 in _start ()