After restoring my personal configuration, kmail works again, but it still 
crashes the same way. I use now qt-2.3.0 from SuSE-rpms.
The X-Mailer line in the mail header says that you are using kmail 1.2.2, a 
newer version than mine! Maybe the bug is already fixed, what would be nice, 
maybe the packages of SuSE are not carefully made.
I will test the current CVS Version as soon as I can in order to check out if 
the bug has already been fixed. Then I will post my results to this adress!

Greetings, 
Patrick