Server is CentOS dovecot.

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[Thread debugging using libthread_db enabled]
[New Thread -1208169728 (LWP 3818)]
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[KCrash handler]
#4  0x04c11f53 in KMMsgBase::storage () from /usr/lib/libkmailprivate.so
#5  0x04d1cdca in KMail::ImapJob::slotGetMessageResult ()
   from /usr/lib/libkmailprivate.so
#6  0x04d1fd0c in KMail::ImapJob::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#7  0x0353beb4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#8  0x03f3ed58 in KIO::Job::result () from /usr/lib/libkio.so.4
#9  0x03f43cd3 in KIO::Job::emitResult () from /usr/lib/libkio.so.4
#10 0x03f4a2fc in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.4
#11 0x03f4bbf1 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.4
#12 0x03f42ecf in KIO::TransferJob::qt_invoke () from /usr/lib/libkio.so.4
#13 0x0353beb4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#14 0x0353c374 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#15 0x03f312ae in KIO::SlaveInterface::finished () from /usr/lib/libkio.so.4
#16 0x03f33cb8 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#17 0x03f3224d in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#18 0x03f2f6f0 in KIO::Slave::gotInput () from /usr/lib/libkio.so.4
#19 0x03f2f885 in KIO::Slave::qt_invoke () from /usr/lib/libkio.so.4
#20 0x0353beb4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#21 0x0353c4e8 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#22 0x038b4fe6 in QSocketNotifier::activated ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#23 0x0355baf5 in QSocketNotifier::event ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x034d70dd in QApplication::internalNotify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x034d7a5c in QApplication::notify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#26 0x005b1851 in KApplication::notify () from /usr/lib/libkdecore.so.4
#27 0x034caaf9 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#28 0x03481340 in QEventLoop::processEvents ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#29 0x034ef82b in QEventLoop::enterLoop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#30 0x034ef736 in QEventLoop::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#31 0x034d6aa9 in QApplication::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#32 0x0804a67d in ?? ()
#33 0x00b7dd5f in __libc_start_main () from /lib/libc.so.6
#34 0x0804a351 in ?? ()

And again.

Crashing stopped when I changed my trash folder for this particular account to behind IMAP connection (same IMAP, I've two active IMAP accounts). When it was crashing, I was using local disk's trash folder. It might have something to do with fact that this is year 2000 model old laptop and with low mem, sometimes disk operations may take time. But I guess kmail should not crash on that anyway.

possible dupe of this one: http://bugs.kde.org/show_bug.cgi?id=107914

Perhaps this should be closed after kmail has been rewritten for kde4?

Bug 205309 seems to be this crash on KDE4.3 :-\

ok, let's close this one. The backtrace is not helpful and KDE3 is dead. (#205309 is not better anyway)