Version:           unknown (using KDE 3.3.0, compiled sources)
Compiler:          gcc version 3.2.3
OS:                Linux (i686) release 2.6.7

Downloading my new mails (all from POP accounts) I think it was during a send of another mail was in progress, I got this crash with the CVS version HEAD from today.
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 1797)]
[KCrash handler]
#4  0x41a34abe in QShared::deref (this=0x7) at qshared.h:50
#5  0x41def962 in QString::deref (this=0x8be3de8) at tools/qstring.cpp:1548
#6  0x41defa18 in QString::operator= (this=0x8be3de8, s=@0xbfffe030)
    at tools/qstring.cpp:1593
#7  0x40a88595 in KPIM::ProgressItem::setStatus (this=0x8be3db8, 
    v=@0xbfffe030) at progressmanager.cpp:116
#8  0x40a9b109 in KPIM::BroadcastStatus::setStatusMsgTransmissionCompleted (
    this=0x85fd4d0, numMessages=-1073750000, numBytes=-1073750016, 
    numBytesRead=36606, numBytesToRead=36606, mLeaveOnServer=false, 
    item=0x8be3db8) at broadcaststatus.cpp:99
#9  0x402d4961 in KMAcctExpPop::slotJobFinished (this=0x8b8efb0)
    at qvaluelist.h:186
#10 0x402d9919 in KMAcctExpPop::qt_cast (this=0x8b8efb0, 
    clname=0xbfffe490 "D\232úA") at kmacctexppop.moc:110
#11 0x402d9dc6 in QMap<QString, int>::remove (this=0x9, k=@0x9) at qmap.h:123
#12 0x41b0132d in QObject::activate_signal (this=0x897e3a0, clist=0x89b9640, 
    o=0xbfffe490) at kernel/qobject.cpp:2357
#13 0x41008527 in KIO::Job::result (this=0x897e3a0, t0=0x897e3a0)
    at jobclasses.moc:156
#14 0x40fef9f0 in KIO::Job::emitResult (this=0x897e3a0) at job.cpp:207
#15 0x40ff1329 in KIO::SimpleJob::slotFinished (this=0x897e3a0) at job.cpp:524
#16 0x40ff4a71 in KIO::TransferJob::slotFinished (this=0x897e3a0)
    at job.cpp:884
#17 0x4100a23c in KIO::TransferJob::qt_invoke (this=0x897e3a0, _id=17, 
    _o=0xbfffe7f0) at jobclasses.moc:1050
#18 0x41b0132d in QObject::activate_signal (this=0x89ed178, clist=0x85d6680, 
    o=0xbfffe7f0) at kernel/qobject.cpp:2357
#19 0x41b011cc in QObject::activate_signal (this=0x89ed178, signal=6)
    at kernel/qobject.cpp:2326
#20 0x40fe3309 in KIO::SlaveInterface::finished (this=0x89ed178)
    at qmetaobject.h:261
#21 0x40fe05e3 in KIO::SlaveInterface::dispatch (this=0x89ed178, _cmd=104, 
    rawdata=@0xbfffea90) at slaveinterface.cpp:255
#22 0x40fdf807 in KIO::SlaveInterface::dispatch (this=0x89ed178)
    at slaveinterface.cpp:191
#23 0x40fdc6f4 in KIO::Slave::gotInput (this=0x89ed178) at slave.cpp:294
#24 0x40fded49 in KIO::Slave::qt_invoke (this=0x89ed178, _id=4, _o=0xbfffec00)
    at slave.moc:113
#25 0x41b0132d in QObject::activate_signal (this=0x89b7ce8, clist=0x84d3468, 
    o=0xbfffec00) at kernel/qobject.cpp:2357
#26 0x41b0169f in QObject::activate_signal (this=0x89b7ce8, signal=2, 
    param=18) at kernel/qobject.cpp:2450
#27 0x41e59c17 in QSocketNotifier::activated (this=0x89b7ce8, t0=18)
    at .moc/debug-shared-mt/moc_qsocketnotifier.cpp:85
#28 0x41b20fdc in QSocketNotifier::event (this=0x89b7ce8, e=0xbfffee80)
    at kernel/qsocketnotifier.cpp:280
#29 0x41a9e65b in QApplication::internalNotify (this=0xbffff7f0, 
    receiver=0x89b7ce8, e=0xbfffee80) at kernel/qapplication.cpp:2635
#30 0x41a9db18 in QApplication::notify (this=0xbffff7f0, receiver=0x89b7ce8, 
    e=0xbfffee80) at kernel/qapplication.cpp:2358
#31 0x415dbebf in KApplication::notify (this=0xbffff7f0, receiver=0x89b7ce8, 
    event=0xbfffee80) at kapplication.cpp:495
#32 0x41a33efb in QApplication::sendEvent (receiver=0x89b7ce8, 
    event=0xbfffee80) at qapplication.h:491
#33 0x41a8c7f8 in QEventLoop::activateSocketNotifiers (this=0x80dec90)
    at kernel/qeventloop_unix.cpp:580
#34 0x41a45ee6 in QEventLoop::processEvents (this=0x80dec90, flags=4)
    at kernel/qeventloop_x11.cpp:383
#35 0x41ab294e in QEventLoop::enterLoop (this=0x80dec90)
    at kernel/qeventloop.cpp:198
#36 0x41a9e849 in QApplication::enter_loop (this=0xbffff7f0)
    at kernel/qapplication.cpp:2790
#37 0x41c9a40d in QDialog::exec (this=0x80f59d0) at dialogs/qdialog.cpp:432
#38 0x414279e0 in KDialogQueue::slotShowQueuedDialog (this=0x89ca568)
    at kdialog.cpp:307
#39 0x41427f39 in KDialogQueue::qt_invoke (this=0x89ca568, _id=2, 
    _o=0xbffff1f0) at kdialog.moc:191
#40 0x41b0132d in QObject::activate_signal (this=0x850dfd8, clist=0x87ff490, 
    o=0xbffff1f0) at kernel/qobject.cpp:2357
#41 0x41e58fd2 in QSignal::signal (this=0x850dfd8, t0=@0x850e000)
    at .moc/debug-shared-mt/moc_qsignal.cpp:100
#42 0x41b1e577 in QSignal::activate (this=0x850dfd8) at kernel/qsignal.cpp:212
#43 0x41b25a93 in QSingleShotTimer::event (this=0x850dfb0)
    at kernel/qtimer.cpp:277
#44 0x41a9e65b in QApplication::internalNotify (this=0xbffff7f0, 
    receiver=0x850dfb0, e=0xbffff480) at kernel/qapplication.cpp:2635
#45 0x41a9db18 in QApplication::notify (this=0xbffff7f0, receiver=0x850dfb0, 
    e=0xbffff480) at kernel/qapplication.cpp:2358
#46 0x415dbebf in KApplication::notify (this=0xbffff7f0, receiver=0x850dfb0, 
    event=0xbffff480) at kapplication.cpp:495
#47 0x41a33efb in QApplication::sendEvent (receiver=0x850dfb0, 
    event=0xbffff480) at qapplication.h:491
#48 0x41a8c6b0 in QEventLoop::activateTimers (this=0x80dec90)
    at kernel/qeventloop_unix.cpp:558
#49 0x41a45f05 in QEventLoop::processEvents (this=0x80dec90, flags=4)
    at kernel/qeventloop_x11.cpp:389
#50 0x41ab294e in QEventLoop::enterLoop (this=0x80dec90)
    at kernel/qeventloop.cpp:198
#51 0x41ab286a in QEventLoop::exec (this=0x80dec90)
    at kernel/qeventloop.cpp:145
#52 0x41a9e7df in QApplication::exec (this=0xbffff7f0)
    at kernel/qapplication.cpp:2758
#53 0x0804a35c in main (argc=3, argv=0xbffff984) at kapplication.h:217