SMTP 错误(220 - 我们不授权使用此系统传输未经请求的 220 和/或批量电子邮件.)

I am current using CodeIgniter 2.2.2 and I have the following code inside my controller:

        $config['protocol'] = "smtp";
        $config['smtp_host'] = "mail.domain.com";
        $config['smtp_port'] = "25";
        $config['smtp_user'] = "noreply@somedomain.com"; 
        $config['smtp_pass'] = "password";
        $config['charset'] = "utf-8";
        $config['mailtype'] = "html";
        $config['newline'] = "
";
        $config['wordwrap'] = TRUE;
        $this->load->library('email');
        $this->email->initialize($config);

        $this->email->set_mailtype('html');
        $this->email->from('noreply@somedomain.com', 'www.somedomain.com');
        $this->email->to('someEmail');


        $this->email->subject('Email Authentication');
        $message = 'Hi';

        $this->email->message($message);

        $this->email->send();

我尝试使用端口 465 和 ssl://xxxxxxx.prod.iad2.secureserver.net.但我一点运气都没有.我试过联系客服，不行.除了给我链接到我已经知道的东西之外，他们真的没有给我太多帮助.为什么我会收到消息?它阻止我向我的其他电子邮件地址发送电子邮件.有人可以帮忙吗?

 $config['protocol'] = "mail";
 $config['smtp_port'] = 587;