Hi there, I have what seems like a major malfunction of the Mail app in OS X 10.8. I can start Mail normally, but Mail does not connect to any of my mail accounts, nor can I send mails. I cannot quit Mail either. I have to force quit Mail. It looks to me like a problem with the access to the key chain. When I recreate a mail account, I am asked to verify the certificate of the mail server. Here Mail gets stuck too. I cannot get out of the dialog (no matter which button I press). When I press Show certificate for example, the dialog blinks and reappears. There is no new dialog where I can see the certificate or edit the trust. Cancel does not cancel the dialog. I have tried a number of things, like resetting the Mac and recreating my key chain. It is not a network problem either. I can setup my mail accounts in Thunderbird and everything works like a charm. Can someone help me? What can I do to tackle the problem (except for Apple support, they couldn't help either - so far)?