Version: (using KDE 4.3.2) OS: Linux Installed from: Compiled From Sources I think this is related to the bugs 192661 and 192778 After a logout, my kde lost it's settings, i got default-settings. Implied with this, kmail lost ALL settings, including rules, smtp, imap and pop3-accounts and identities! I can reproduce this if i kill X while i am logged in in kde, i have this now since the first(!) KDE v4 release until now, so it has something to do with KDE v4. Possible explanation: It seems to me, that beginning with kde 4 after a kde-crash, kde reinitializes it's own settings and deletes them unfortunately. As theese settings are in the same place as the settings for kmail, i believe that with this reinitialization the kmail settings die.
Must be something else. Never lost settings although my system crashs sometimes for various reasons
*** This bug has been marked as a duplicate of bug 192778 ***
I had the same problem about three times, in a year. Maybe have somethingto do with KDE version updates. I think that this bug shouldn't be marked as duplicate of bug 192778, but the failure 192778 should be marked as a duplicate of this one.