The Outgoing server (SMTP) %S does not seem to support encrypted passwords. If you just set up the account, try changing the 'Authentication method' in 'Account settings | Outgoing server (SMTP)' to 'Normal password'.
O servidor de saída (SMTP) %S semella que non admite contrasinais cifrados. Se acaba de crear a conta, tente cambiar o 'Método de autenticación' a 'Contrasinal normal' na 'Configuración da conta | Servidor de saída (SMTP)'.