Created attachment 1007 [details] full backtrace (without symbols) not reproducable. Now and then claws mail just crashes.
Created attachment 1008 [details] full backtrace (with symbols)
Created attachment 1009 [details] another full bt with symbols
Created attachment 1011 [details] full backtrace #4
Need a better description here, see http://www.thewildbeast.co.uk/claws-mail/bugzilla/page.cgi?id=bug-writing.html
If I could give a better description I already would have done so. Since the segfaults happen very erratic I can't.
Created attachment 1018 [details] full backtrace #5
Today happened with version 3.7.10cvs63, see bt #6
Created attachment 1035 [details] full backtrace #6