if (!_retval) return NS_ERROR_NULL_POINTER;
NS_ENSURE_ARG_POINTER(_retval);
nsMsgAccountManager::CreateAccount(nsIMsgAccount **_retval){    if (!_retval) return NS_ERROR_NULL_POINTER;    const char *key=getUniqueAccountKey("account", m_accounts);    return createKeyedAccount(key, _retval);}