Application that crashed: kmail
Version of the application: 1.12.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.9-174.fc12.i686 i686
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
KMail (Fedora 12 i386) crashes after sometime from the startup (about 5-10 minutes), in the meanwhile it's very slow and almost unusable. It seems to access the disk very heavily (i/o wait is high) at startup.
Sometimes KMail is able to start but is incredibly slow and crashes after some time.
I am accessing two POP3 accounts (downloading mail locally) and one IMAP account. 

 -- Backtrace:
Application: KMail (kmail), signal: Aborted
[KCrash Handler]
#6  0x00de1416 in __kernel_vsyscall ()
#7  0x00e0ca81 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#8  0x00e0e34a in abort () at abort.c:92
#9  0x00d54a97 in __gnu_cxx::__verbose_terminate_handler () at ../../../../libstdc++-v3/libsupc++/vterminate.cc:93
#10 0x00d52906 in __cxxabiv1::__terminate (handler=<value optimized out>) at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:38
#11 0x00d52943 in std::terminate () at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:48
#12 0x00d529fc in __cxxabiv1::__cxa_rethrow () at ../../../../libstdc++-v3/libsupc++/eh_throw.cc:116
#13 0x07e03877 in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:214
#14 0x07e05bf7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#15 0x038fc9a8 in QApplication::exec () at kernel/qapplication.cpp:3525
#16 0x0804a59e in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.3.4/kmail/main.cpp:146

Reported using DrKonqi