$this->load->library('email') version codeigniter 3.1.10,

i have this problem, when I add this code:

$configEmail = array(

'protocol' => 'mail',
'smtp_host' => 'mail.**********.com',
'smtp_port' => 25,
'smtp_user' => '[email protected]*******.com',
'smtp_pass' => *******,
'mailtype' => 'html',
'charset' => 'utf-8',
'newline' => "\r\n"

); 

$this->email->initialize($configEmail);
$this->email->from('[email protected]*******.com', '****.');
$this->email->to('**********@*******.com');
$this->email->subject('hi');
$this->email->message('Saludos');


the server sends me the next warning

"Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request."


The problem is my code or I have to do something on the server?

[font=Roboto, arial, sans-serif]formerly, after the problem I use [/font]

[font=Consolas,]$this->email->send()
[/font]
and helping me to solve the problem.

thanks and regards