Version:            (using KDE 4.3.5)
Installed from:    Gentoo Packages

Hello, I have had kmail crash at close:
Application: KMail (kmail), signal: Aborted
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.2200.3-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
The current source language is "auto; currently c".
[KCrash Handler]
#27 0x00007f555d650896 in *__GI___poll (fds=0x2bab860, nfds=12, timeout=49) at ../sysdeps/unix/sysv/linux/poll.c:87
#28 0x00007f5556bc2a81 in g_main_context_poll (context=0x236f040, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2904
#29 g_main_context_iterate (context=0x236f040, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2586
#30 0x00007f5556bc2d5e in IA__g_main_context_iteration (context=0x236f040, may_block=1) at gmain.c:2654
#31 0x00007f555f4a4564 in QEventDispatcherGlib::processEvents (this=0x236c820, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007f555e2b9b28 in QGuiEventDispatcherGlib::processEvents (this=0x2bab860, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f555f4795fe in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007f555f4797f4 in QEventLoop::exec (this=0x7fff3d45bb40, flags=...) at kernel/qeventloop.cpp:197
#35 0x00007f555f47bf30 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00000000004033db in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/kmail-4.3.5/work/kmail-4.3.5/kmail/main.cpp:146
Thanks to fix it.