Version:           svn 4.3 branch, r1010261 (kdepim) (using Devel)
Compiler:          gcc (Gentoo 4.3.2-r3 p1.6, pie-10.1.5) 4.3.2 
OS:                Linux
Installed from:    Compiled sources

I'm using IMAP account if that matters.

Backtrace:

Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fa4d204c720 in QListData::shared_null () from /usr/lib64/qt4/libQtCore.so.4
#6  0x00007fa4cbf366e7 in qDeleteAll<QList<KIO::Slave*>::const_iterator> (begin={i = 0x7fffdbf96e20}, end={i = 0x7fffdbf96e10}) at /usr/include/qt4/QtCore/qalgorithms.h:350
#7  0x00007fa4cbf370c5 in qDeleteAll<QList<KIO::Slave*> > (c=@0x7fffdbf96e50) at /usr/include/qt4/QtCore/qalgorithms.h:358
#8  0x00007fa4cbf37d02 in KIO::SchedulerPrivate::ProtocolInfo::~ProtocolInfo (this=0x1b46380, __in_chrg=<value optimized out>, __in_chrg=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.3.9999/work/kdelibs-4.3.9999/kio/kio/scheduler.cpp:171
#9  0x00007fa4cbf37d89 in qDeleteAll<QHash<QString, KIO::SchedulerPrivate::ProtocolInfo*>::const_iterator> (begin={i = 0x1b90960}, end={i = 0x1975fb0}) at /usr/include/qt4/QtCore/qalgorithms.h:350
#10 0x00007fa4cbf37ddb in qDeleteAll<KIO::SchedulerPrivate::ProtocolInfoDict> (c=@0x1832a40) at /usr/include/qt4/QtCore/qalgorithms.h:358
#11 0x00007fa4cbf38014 in KIO::SchedulerPrivate::~SchedulerPrivate (this=0x18329d0, __in_chrg=<value optimized out>, __in_chrg=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.3.9999/work/kdelibs-4.3.9999/kio/kio/scheduler.cpp:103
#12 0x00007fa4cbf324bd in <anonymous struct>::destroy(void) () at /var/tmp/portage/kde-base/kdelibs-4.3.9999/work/kdelibs-4.3.9999/kio/kio/scheduler.cpp:209
#13 0x00007fa4cbe8b569 in KCleanUpGlobalStatic::~KCleanUpGlobalStatic (this=0x7fa4cc26dc58, __in_chrg=<value optimized out>, __in_chrg=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.3.9999/work/kdelibs-4.3.9999/kdecore/kernel/kglobal.h:62
#14 0x00007fa4d14076fd in exit () from /lib/libc.so.6
#15 0x00007fa4d13ef5cd in __libc_start_main () from /lib/libc.so.6
#16 0x00000000004024d9 in _start ()