Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30.9-96.fc11.i586 i686
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
After enabling the "Mangle To/From Headers" groupware option kontact crashed (segfaulted), and will no longer start, trying to start kmail directly fails in the same way with the following output:

[trav@cirrus ~]$ kmail
[trav@cirrus ~]$ *** KMail got signal 11 (Crashing)
KCrash: Application 'kmail' crashing.
sock_file=/home/users/trav/.kde/socket-cirrus.lan.noggin.com.au/kdeinit4__0


 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  0x007198a5 in KMailICalIfaceImpl::readConfig (this=0x956aab0) at /usr/src/debug/kdepim-4.3.2/kmail/kmailicalifaceimpl.cpp:1789
#7  0x005e4e9c in KMKernel::setupDBus() () from /usr/lib/libkmailprivate.so.4
#8  0x0804a575 in main (argc=1, argv=0xbf9a5934) at /usr/src/debug/kdepim-4.3.2/kmail/main.cpp:138

Reported using DrKonqi