邮件发送是代码点火器失败

Question

在CodeIgniter中，使用以下脚本进行邮件发送时，我的邮件发送代码失败。

$config = array(
    'protocol' => 'mail',
    'mailtype' => 'html',
    'starttls'  => true,
    'wordwrap' => TRUE,
    'priority' => '1'
);

$this->email->initialize($config);
$this->email->from('abc@gmail.com', 'Website');
$this->email->to('customersupport@abc.com');
$this->email->subject('This is an email test');
$this->email->message("gggggggg");
$this->email->send();