Can not reproduce while running kmail stand alone or within kontact. I'm asked for password after account creation. I can enter password and save it also. But no crashes. I'm on kmail 1.11.2(kde 4.2.2). Feel free to reopen if you can still reproduce it.

I think I saw this one surface once again... Still haven't found a reliable way to reproduce it though...

What I did:

1) Set up the personal account and mailserver (IMAP)
2) Checked mail via CTRL+L
3) Entered password
4) Kontact (kmail) from KDE-4.2.3 crashed with the backtrace below

[Thread debugging using libthread_db enabled]
[New Thread 0x7fec52255750 (LWP 10087)]
[New Thread 0x426e5950 (LWP 10114)]
[KCrash handler]
#5  0x0000000001498640 in ?? ()
#6  0x00007fec3dbccf2a in KMail::ImapAccountBase::makeConnection (
    this=0x14d6a80)
    at /var/tmp/portage/kde-base/kmail-4.2.3-r1/work/kmail-4.2.3/kmail/imapaccountbase.cpp:336
#7  0x00007fec3db08569 in AccountsPageReceivingTab::save (
    this=<value optimized out>)
    at /var/tmp/portage/kde-base/kmail-4.2.3-r1/work/kmail-4.2.3/kmail/configuredialog.cpp:1196
#8  0x00007fec3db16eb7 in ConfigModuleWithTabs::save (this=0x14a1910)
    at /var/tmp/portage/kde-base/kmail-4.2.3-r1/work/kmail-4.2.3/kmail/configuredialog_p.cpp:323
#9  0x00007fec49739ef0 in KCModuleProxy::save (this=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3/kutils/kcmoduleproxy.cpp:276
#10 0x00007fec4973702c in KCMultiDialogPrivate::apply (
    this=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3/kutils/kcmultidialog.cpp:192
#11 0x00007fec49738629 in KCMultiDialog::qt_metacall (this=0x146e1c0, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff5a2a4140)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3_build/kutils/kcmultidialog.moc:86
#12 0x00007fec3db0e77a in ConfigureDialog::qt_metacall (this=0x14d6a80, 
    _c=1512717520, _id=0, _a=0x7fff5a2a3ba0)
    at /var/tmp/portage/kde-base/kmail-4.2.3-r1/work/kmail-4.2.3_build/kmail/configuredialog.moc:67
#13 0x00007fec4caa0900 in QMetaObject::activate (sender=0x146e1c0, 
    from_signal_index=<value optimized out>, to_signal_index=42, 
    argv=0x7fff5a2a3ba0) at kernel/qobject.cpp:3025
#14 0x00007fec4e6fc601 in KDialog::slotButtonClicked (this=0x146e1c0, 
    button=8)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3/kdeui/dialogs/kdialog.cpp:847
#15 0x00007fec4e6fde50 in KDialog::qt_metacall (this=0x146e1c0, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff5a2a4370)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3_build/kdeui/kdialog.moc:181
#16 0x00007fec4e7778b2 in KPageDialog::qt_metacall (this=0x14d6a80, 
    _c=1512717520, _id=0, _a=0x7fff5a2a3ba0)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3_build/kdeui/kpagedialog.moc:63
#17 0x00007fec497385c6 in KCMultiDialog::qt_metacall (this=0x14d6a80, 
    _c=1512717520, _id=0, _a=0x7fff5a2a3ba0)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3_build/kutils/kcmultidialog.moc:77
#18 0x00007fec3db0e77a in ConfigureDialog::qt_metacall (this=0x14d6a80, 
    _c=1512717520, _id=0, _a=0x7fff5a2a3ba0)
    at /var/tmp/portage/kde-base/kmail-4.2.3-r1/work/kmail-4.2.3_build/kmail/configuredialog.moc:67
#19 0x00007fec4caa0900 in QMetaObject::activate (sender=0x1471308, 
    from_signal_index=<value optimized out>, to_signal_index=4, 
    argv=0x7fff5a2a3ba0) at kernel/qobject.cpp:3025
#20 0x00007fec4caa415e in QSignalMapper::mapped (this=0x14d6a80, _t1=8)
    at .moc/debug-shared/moc_qsignalmapper.cpp:93
#21 0x00007fec4caa4200 in QSignalMapper::map (this=0x1471308, 
    sender=0x147f9b0) at kernel/qsignalmapper.cpp:277
#22 0x00007fec4caa55c0 in QSignalMapper::qt_metacall (this=0x1471308, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff5a2a44f0) at .moc/debug-shared/moc_qsignalmapper.cpp:80
#23 0x00007fec4caa0900 in QMetaObject::activate (sender=0x147f9b0, 
    from_signal_index=<value optimized out>, to_signal_index=30, 
    argv=0x7fff5a2a3ba0) at kernel/qobject.cpp:3025
#24 0x00007fec4da809e7 in QAbstractButton::clicked (this=0x14d6a80, _t1=false)
    at .moc/debug-shared/moc_qabstractbutton.cpp:185
#25 0x00007fec4d8245eb in QAbstractButtonPrivate::emitClicked (this=0x147ddd0)
    at widgets/qabstractbutton.cpp:544
#26 0x00007fec4d825f82 in QAbstractButtonPrivate::click (this=0x147ddd0)
    at widgets/qabstractbutton.cpp:537
#27 0x00007fec4d8261b5 in QAbstractButton::mouseReleaseEvent (this=0x147f9b0, 
    e=0x7fff5a2a4e10) at widgets/qabstractbutton.cpp:1116
#28 0x00007fec4d582674 in QWidget::event (this=0x147f9b0, 
    event=0x7fff5a2a4e10) at kernel/qwidget.cpp:7169
#29 0x00007fec4d52fa2d in QApplicationPrivate::notify_helper (this=0x62ea80, 
    receiver=0x147f9b0, e=0x7fff5a2a4e10) at kernel/qapplication.cpp:3809
#30 0x00007fec4d5375e5 in QApplication::notify (this=<value optimized out>, 
    receiver=0x147f9b0, e=0x7fff5a2a4e10) at kernel/qapplication.cpp:3534
#31 0x00007fec4e75bf84 in KApplication::notify (this=0x7fff5a2a5a70, 
    receiver=0x147f9b0, event=0x7fff5a2a4e10)
    at /var/tmp/portage/kde-base/kdelibs-4.2.3/work/kdelibs-4.2.3/kdeui/kernel/kapplication.cpp:307
#32 0x00007fec4ca8bbe0 in QCoreApplication::notifyInternal (
    this=0x7fff5a2a5a70, receiver=0x147f9b0, event=0x7fff5a2a4e10)
    at kernel/qcoreapplication.cpp:589
#33 0x00007fec4d536962 in QApplicationPrivate::sendMouseEvent (
    receiver=0x147f9b0, event=0x7fff5a2a4e10, alienWidget=0x147f9b0, 
    nativeWidget=0x146e1c0, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7fec4de19730)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#34 0x00007fec4d5939dc in QETWidget::translateMouseEvent (this=0x146e1c0, 
    event=<value optimized out>) at kernel/qapplication_x11.cpp:4050
#35 0x00007fec4d59260b in QApplication::x11ProcessEvent (this=0x8b, 
    event=0x7fff5a2a56e0) at kernel/qapplication_x11.cpp:3168
#36 0x00007fec4d5b65c4 in x11EventSourceDispatch (s=0x62ab70, callback=0, 
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#37 0x00007fec48145614 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#38 0x00007fec481474d7 in g_main_context_iterate ()
   from /usr/lib/libglib-2.0.so.0
#39 0x00007fec481475bd in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#40 0x00007fec4cab2b1f in QEventDispatcherGlib::processEvents (this=0x62dd00, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:325
#41 0x00007fec4d5b5e1f in QGuiEventDispatcherGlib::processEvents (
    this=0x14d6a80, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:204
#42 0x00007fec4ca8a812 in QEventLoop::processEvents (
    this=<value optimized out>, flags={i = 1512724896})
    at kernel/qeventloop.cpp:149
#43 0x00007fec4ca8a9a5 in QEventLoop::exec (this=0x7fff5a2a59e0, flags=
      {i = 1512724976}) at kernel/qeventloop.cpp:196
#44 0x00007fec4ca8f747 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:851
#45 0x00000000004040a9 in main (argc=1, argv=0x7fff5a2a5f88)
    at /var/tmp/portage/kde-base/kontact-4.2.3/work/kontact-4.2.3/kontact/src/main.cpp:218

Thank you for your report. Kmail1 is currently unmaintained and the code has changed sufficiently in Kmail2 so the backtraces are not really useful anymore. Should you experience the same crash in Kmail 4.8.5 or later, please open a new report for Kmail2. Thank you for your understanding