private function getDefaultAccountId($user = null)
 {
     if (!$user) {
         $user = logged_user();
     }
     $default_account = MailAccountUsers::findOne(array('conditions' => array('`user_id` = ? AND `is_default` = ?', $user->getId(), true)));
     if ($default_account instanceof MailAccountUser && $default_account->getAccount() instanceof MailAccount) {
         return $default_account->getAccount()->getId();
     }
     return 0;
 }
 function getByAccountAndUser($account, $user)
 {
     return MailAccountUsers::findOne(array('conditions' => array('`account_id` = ? AND `user_id` = ?', $account->getId(), $user->getId())));
 }