Before this you need to define Email configuration in email.php under Config folder
Here we have gmail configuration for example
class EmailConfig {
public $gmail = array(
'host' => 'ssl://smtp.gmail.com',
'port' => 465,
'username' => 'username@gmail.com',
'password' => '*****',
'transport' => 'Smtp'
);
}
then you can use this setting in controller like
$Email= new CakeEmail('gmail');
Inshort you have to configure SMTP according to requirement. I hope this will be handy for you. Thanks