As you can read in the url I posted kmail has problems sending mail to people you have encription keys for, even if you don't encrypt the mail you're sending. Fixaround is disabling gpg support in kmail. Error is glibc related: *** glibc detected *** double free or corruption (out): 0x086712e8 *** *** KMail got signal 6 (Crashing) Rebuilding kmail or gnupg doesn't solve the problem.
No it's not glibc related, there's something that's trying to double free a pointer, that's plainly wrong. Try to get a backtrace out of it, and please post emerge info.
You can workaround it by setting MALLOC_CHECK_ environment variable to 0, but that's just a hack.
I also had this bug. For me, this was solved after re-merging glibc, qt, kdelibs and kmail with the same compiler. I switched the compilter (3.3.6 to 3.4.4) just before the kde upgrade, so glibc and qt had been compiled with 3.3.6 and kde with 3.4.4. Recompiling all of them with 3.4.4 solved this.
*** This bug has been marked as a duplicate of 61146 ***