That file is created in nsMsgFilterService::SaveFilterList(), and there's must have been something gone wrong, because the tmpFiltersFile->Delete() is never reached. Can you check if there is a file in your profile called tmprules.dat or msgFilterRules.dat, which is read only ?
That file is created in nsMsgFilterServ ice::SaveFilter List(), and there's must have been something gone wrong, because the tmpFiltersFile- >Delete( ) is never reached. Can you check if there is a file in your profile called tmprules.dat or msgFilterRules.dat, which is read only ?